I have used this cover to cover the tow jack on my trailer which has been parked up on the drive of my beach house for the last 12+ months. It has therefore been subjected to a marine type environment which plays havoc with house door fittings etc. The cover has survived intact and is now still in an "as new" condition. I am very pleased with this purchase and highly recommend it. 424779
After what seemed like a hundred cranks, your trailer is lifted enough to attach the hitch to your truck, but your arm feels ready to fall off. An electric trailer jack can save your arm by lifting your trailer hitch with just the touch of a button. Most electric jacks use 12V power, so you can hook them up to a battery while you are out on the go and not worry about finding an outlet. Most models also include a manual jack handle as well so you can still lift the trailer, even if your battery runs out of power. The Barker electric trailer jack is a commonly found option, and the VIP 3500 can handle most campers and travel trailers, as it is rated to lift up to 3,500 lbs. This model lifts trailers up to 18 inches, so you can easily attach your trailer to your truck or SUV. There are many electric trailer jack options available with many lift capabilities, and with the large inventory available on eBay, you can lift your trailer with the touch of a button in no time.
The former, obviously, and through personal experience, is much harder to use than the latter. However, the primary benefit of the manual jack is that it COULD be less prone to breaking since it is a simpler device. The electric trailer jack could fail electrically or mechanically. The electric trailer jack will also require installation or some know-how as far as wiring goes. 
Designed for use with your Bulldog 2-speed planetary jack, this powered drive offers quieter operations and a more efficient use of electrical power than competitive units. Lifting has never been Features: Makes lifting with your Bulldog jack faster and easier Fits Bulldog 2-speed, planetary-gear jacks with 12,000-lb static capacity Works great for horse, livestock and heavy-duty trailers
There are several places water can get into any given jack. Water should be able to drain out though. If the exit points which would be at the lowest point are clogged then the water would not be able to exit. You could use a jack cover like # UF38-944020 for future use. There is no telling how much damage is really done. If there is enough corrosion then something inside could be structurally compromised and fail when you have weight on the jack. I would not be comfortable offering...
Jack Cover, (John Higson Cover, Jr.), American physicist and inventor (born April 6, 1920, New York, N.Y.—died Feb. 7, 2009, Mission Viejo, Calif.), spent most of his career in aerospace but became famous in the mid-1970s for inventing the TASER, a handheld weapon that fires darts attached to insulated wires to deliver debilitating electric shocks at ranges of up to several metres. Cover’s goal was to devise a nonlethal means of stopping violent acts, such as riots and hijackings. Though the TASER was initially classified as a firearm because the darts were propelled by gunpowder, in 1993 Cover used compressed nitrogen to activate the darts; the modification allowed the public to purchase his invention. The TASER name (a registered trademark) was a modified acronym from the title of one of Cover’s favourite childhood books: Tom Swift and His Electric Rifle.
Things like that, that just tend to build up over time when things sit. When it's time to take it off, we'll simply press the button in our toggle, spread the bottom, pull it off and we'll tuck it away until we need it next time to cover up our jack. Not only is this going to work out really good for our Ultra Fab products, but it's also going to work on different Bulldog, Barker, Husky, At Wood 00:01:26, inaudible 00:01:27, Sequent 00:01:27, Component, Odyssey and Ultra Series jacks. That's going to complete our look at the Ultra Fab A-frame jack cover, part number UF38-944020.
Use this electric tongue jack to lift your trailer with the flip of a switch. The sturdy steel jack can handle up to 3,500 lbs. It has 19" of travel and a 5" drop leg for extra lift. LED Features: Electric jack with 12V motor lets you lift and lower your A-frame trailer quickly and easily Top-mounted toggle switches are easily accessible Large LED side lights make it simple to set
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