VEVOR EJ3550B Electric Trailer Jack: 4,000 lb capacity and specs

The VEVOR EJ3550B is a 12V electric tongue jack for trailers. It raises and lowers the front of a trailer at the push of a switch, which replaces the hand-cranking that a manual jack needs. VEVOR positions it for RV trailers, horse trailers, utility trailers and yacht trailers. Here is what its specifications mean.

Capacity and power

VEVOR rates the jack at 4,000 lbs (1,815 kg). That is a lifting capacity, not necessarily the weight of your whole trailer. What matters is the tongue weight, which is the downward force the coupler puts on the jack, and it is typically only a fraction of the total trailer weight. Check your trailer's documented tongue weight and keep well within the 4,000 lb figure.

The jack runs on DC 12V with a maximum power of 350W, so it is designed to connect to a 12V source such as the tow vehicle or trailer battery. Follow the manual for wiring, fuse and cable guidance.

Stroke and height range

The listing gives a stroke of 460 mm (18.11 inches) and a lifting range of 250 to 710 mm (9.84 to 27.95 inches). The overall height range runs from 250 to 860 mm (9.84 to 33.85 inches). In practice, the closed height tells you whether the jack fits under a low coupler, and the extended height tells you whether it reaches the ground with the trailer hitched to a tall vehicle. VEVOR says the multi-level adjustable height suits both high-profile and low-profile trailers and helps level a trailer on uneven ground. Measure your coupler height before choosing.

Mounting

The hole pitch is 1.97 inches (50 mm). VEVOR says a 90-degree rotating installation hole avoids interference with the tailgate and helps keep installation straightforward. Check the mounting pattern and tube dimensions on your trailer frame against the jack before drilling or welding anything.

Materials and weather protection

The body is carbon steel with a protective coating, and the brand says it is designed to withstand splashes and outdoor conditions. A waterproof sunshade cover is included to protect against water and UV. Cover it when not in use, and look after the coating as the manual advises.

Hand crank backup

If power fails, a crank handle lets you raise or lower the jack by hand. That is a useful fallback for a part that sits on the trailer, though cranking is slower than the motor.

Size and weight

The jack weighs 10 kg (about 22 lb), and its height is about 33.9 inches when fully extended. That is something to bear in mind for installation, as you will want a helper to hold it in place.

What's in the box

• 1 x trailer jack
• 1 x crank handle
• 1 x waterproof sunshade cover
• 1 x manual

What to check before you buy

• Tongue weight: confirm your trailer's tongue weight and stay well within the jack's stated capacity.
• Heights: measure the coupler height when closed and fully extended against 9.84 and 33.85 inches.
• Mounting: match the bolt pattern and frame tube size, and check your trailer maker's guidance.
• Wiring: you need a suitable 12V supply, switch, fuse and cabling. Follow the manual and local codes.
• Use: an electric jack is for raising and lowering the tongue, not for lifting a vehicle or working under a load. Support the trailer as the manual directs.
• Upkeep: keep it clean, covered and lubricated as advised.

The short version

• A 12V, 350W electric tongue jack rated by VEVOR at 4,000 lbs (1,815 kg).
• Stroke of 18.11 inches and height range of 9.84 to 33.85 inches.
• Carbon steel with a protective coating, plus a waterproof sunshade cover.
• Hand crank included for use if power fails.
• Weighs about 22 lb and suits RV, horse, utility and yacht trailers.

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