Wiktor Wise
Electric jacks are used to power a motor that raises or lowers the jack's leg. They are essential accessories that ensure the proper use of your trailer. When measuring an electric jack, it is important to consider the weight capacity, lift height, and tongue weight. The weight capacity of a jack refers to its ability to accommodate the tongue weight of different trailer types and sizes. The tongue weight of a trailer is typically between 10 and 15 percent of the loaded trailer's weight. The lift height of a jack also varies depending on the size of the trailer.
| Characteristics | Values |
|---|---|
| Type | Electric jacks, Manual jacks, Hydraulic jacks |
| Operation | Powered by electricity or manually |
| Weight capacity | Should match the tongue weight of the trailer |
| Lift height | Should be 4" above the height from the ground to the bottom of the coupler |
| Terrain | Consider the type of terrain the jack will be used on |
| Trailer type | Consider the type of trailer the jack will be used on |
| Hauling needs | Consider the weight the jack needs to be able to lift |
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What You'll Learn
Tongue weight: 10-15% of a loaded trailer's weight
To measure the size of an electric trailer jack, you need to consider the height and lift required. If you already have a jack installed, you can use its measurements as a starting point. Alternatively, you can measure the height from the ground to the bottom of the coupler with the trailer levelled on flat ground. The jack should be able to extend about 4" above this measurement to allow for easy connection and disconnection of the trailer.
Now, let's focus on the topic of tongue weight, which is crucial for safe towing. Tongue weight refers to the downward force exerted at the vehicle-trailer coupling point when your trailer is hooked up for towing. It is recommended that the tongue weight be about 10-15% of the gross trailer weight. This ensures that the trailer is properly balanced and reduces the risk of trailer sway or impaired control for the driver.
To measure tongue weight, you can use a tongue weight scale, a bathroom scale, or a vehicle scale. Here's a step-by-step guide using a bathroom scale:
- Park your vehicle and trailer on level ground and ensure the wheels are chocked.
- Place a 2x4 stud or a sturdy board directly below the trailer tongue. The board should be at least 3.5 feet long.
- Position a bathroom scale about 2 feet from the trailer tongue and a block or brick about 1 foot from the trailer tongue.
- Protect the bathroom scale with a small piece of plywood.
- Center the stud on two horizontal pipes, one under the scale and one under the block.
- Measure the distance from the trailer tongue to ensure proper placement.
- Take a reading from the bathroom scale and triple it to find the tongue weight.
By following these steps, you can ensure that your tongue weight is within the recommended range of 10-15% of the loaded trailer's weight, contributing to a safer towing experience.
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Lift height: Varies with trailer size
When selecting an electric jack, it is important to consider the lift height, which varies with trailer size. The jack should be able to lift the trailer tongue to a specific height, making it level. This ensures that it is easy to hitch and unhitch the vehicle, load and unload, and work in the trailer.
To determine the correct lift height, you should measure the height from the ground to the bottom of the trailer coupler when the trailer is parked on level ground. The jack should be able to extend about 4 inches above this measurement, allowing you to raise it over the ball for connecting and disconnecting the trailer. Additionally, the jack should retract enough to be shorter than the coupler height when the trailer is level, and it should clear the ground when the trailer is being towed.
The weight capacity of the jack is also crucial. It should match the tongue weight of your trailer, which is typically around 10% of the gross trailer weight (GTW) or the total weight of your fully loaded trailer. By considering both the lift height and weight capacity, you can choose an electric jack that safely and efficiently meets your trailer's specific requirements.
It is worth noting that different types of electric jacks are available, such as A-frame, heavy-duty, and side-mount jacks, each with varying weight capacities and features. When selecting an electric jack, it is important to consider not only the lift height and weight capacity but also the specific features that suit your trailer's size and your usage needs.
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Terrain, trailer type, and hauling needs
When selecting an electric jack, it is important to consider the terrain, trailer type, and hauling needs. These factors will help determine the size and capacity of the jack required.
For rough or uneven terrain, it is advisable to choose a jack with a smaller retracted height to prevent it from hitting the ground. Swivel jacks, for instance, are suitable for such terrain as they have a lower weight rating and provide more ground clearance. They also prevent the jack from being damaged when towed over uneven surfaces.
The type of trailer is another crucial factor. A-frame jacks, for example, are designed to bolt onto an A-frame hitch, while marine jacks are specifically made to withstand regular water exposure for fishing or boating activities. Additionally, the weight of the trailer tongue needs to be considered. Electric jacks have varying weight capacities, and it is recommended to select one that exceeds the tongue weight of the fully loaded trailer.
Hauling needs should also be taken into account. If you frequently haul heavy loads, opt for a heavy-duty electric jack with a higher weight capacity. These jacks often require brackets for added stability and support. It is also worth noting that electric jacks can be more reliable and convenient than manual jacks, especially if you are not physically fit to operate a manual jack.
In summary, by considering the terrain, trailer type, and hauling needs, you can choose an electric jack with the appropriate size, capacity, and features to meet your specific requirements.
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Electric vs. manual jacks
When it comes to electric vs manual jacks, there are several factors to consider. Firstly, let's discuss the purpose and frequency of use. If you only need a jack for occasional light-duty tasks, a manual jack may suffice. Manual jacks are typically used for emergency roadside tyre changes or minor maintenance. On the other hand, electric jacks are more suitable for heavy-duty and frequent use, especially in warehouses, factories, or businesses dealing with heavy palletized loads.
Now, let's talk about performance and efficiency. Electric jacks offer increased productivity and throughput due to their motor-powered movement, allowing for quicker transportation of pallets or lifting of heavier loads. They also reduce physical strain on the user, minimising fatigue and the risk of injury, especially with repetitive tasks. Conversely, manual jacks require significant physical effort and can lead to awkward postures, increasing the risk of musculoskeletal issues.
The work environment is another crucial consideration. Electric jacks are ideal for large, open spaces and can handle heavier pallets and stacking tasks. However, they tend to be larger and heavier, making them less manoeuvrable in tight spaces. Manual jacks, on the other hand, are more compact and lightweight, providing greater manoeuvrability in confined areas.
Cost is also a differentiating factor. Electric jacks have a higher initial cost and require regular maintenance, including battery checks and charging. They are also dependent on electricity, limiting operation time and requiring access to power outlets. Manual jacks, on the other hand, are significantly cheaper, have simple operations, and can be used anywhere without the need for power outlets.
Finally, let's discuss safety and durability. While scissor jacks, whether electric or manual, have been deemed unsafe by some users, electric jacks can provide increased safety by reducing physical strain. Manual jacks may be safer for roadside emergencies as they do not rely on electricity or batteries. In terms of durability, manual jacks are often considered more reliable due to their fewer moving parts, requiring less frequent repairs.
To summarise, the decision between an electric or manual jack depends on your specific needs, work environment, budget, and priorities. Electric jacks offer increased performance, efficiency, and safety for heavy-duty and frequent use but come with higher costs and maintenance requirements. Manual jacks are more cost-effective, simple to operate, and versatile in confined spaces but may require significant physical effort and pose ergonomic concerns.
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Weight capacity: Match jack to trailer tongue weight
When choosing an electric jack, it's important to consider the weight capacity and ensure it matches your trailer's tongue weight. The tongue weight refers to the amount of weight not on the suspension or forward of the axles, or specifically, the weight on the trailer tongue or coupler when the trailer is fully loaded and ready to tow. It is typically calculated as a percentage of the total weight of the trailer, including cargo.
For most trailers, the recommended tongue weight is between 10% and 15% of the total trailer weight. For boat trailers, the tongue weight is usually calculated as 7-10% of the fully loaded trailer weight. For example, if you have a 6000-pound loaded boat trailer, using the 10% guideline, you would require a tongue jack with a capacity of 600 pounds.
To determine the tongue weight of your trailer, you can use a scale. Load your trailer as you would for a trip, then place the scale under the tongue jack and lift it off the towing vehicle. The scale reading will give you the tongue weight. Ensure the scale is capable of handling enough weight; for example, if your trailer weighs 10,000 pounds, the scale should be able to handle up to 4000 pounds to get an accurate tongue weight reading.
Once you have determined the tongue weight of your trailer, you can choose an electric jack with a capacity that exceeds this weight. It is recommended to select a jack with a capacity greater than the tongue weight to ensure the jack doesn't have to work too hard and will last longer. For example, if your trailer tongue weight is 3500 pounds, you may consider the Ultra-Fab #UF38-944017, which has a tongue weight capacity of 3500 pounds and would be suitable, depending on your trailer's weight.
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Frequently asked questions
The correct size of an electric jack for your trailer should match the tongue weight of your trailer. The tongue weight should be roughly 10% of the gross trailer weight (GTW). The GTW is the total weight of your fully loaded trailer. You should also consider the lift height of the jack, which varies depending on the size of the trailer.
There are two main types of electric jacks: manual jacks and electric jacks. Manual jacks are designed to operate by hand and are easy to use. Electric jacks, on the other hand, use electricity to power a motor that lowers or raises the jack's leg. They feature a head with controls that allow for convenient operation.
When choosing an electric jack, consider the weight capacity, lift height, terrain, trailer type, and your specific needs. It is important to invest in a quality jack to ensure the safety and stability of your trailer. Additionally, consider the power source for the electric jack, as they can be powered by a trailer or tow vehicle battery, or any source of 12-volt power.
