Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring. Powered converter reduces strain on wiring system. cargo area on the driver's side and passenger's side. You will have to remove the jack storage cover and some interior paneling to access this harness. Once you've plugged in the connector,

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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
The RV electric jack cover protects your unit from UV damage and environmental hazards. Universal RV electric jack covers are an excellent solution for protecting the finish and prolonging the original appearance of these systems. Each cover has 1/8″ strong and durable draw rope with a barrel cord lock in the hem for quick easy installation and removal. Recommended for storage only.
This electric A-frame jack offers 22" of total travel and features an LED courtesy light for simple nighttime operation. Crank included for manual override in case of power failure. Features: Tongue jack positions quickly and easily with integrated drop leg Powered drive provides quiet operation and efficient use of electrical power No more hand cranking Easy-to-access on/off

According to the information I was able to find, the Ultra-Fab Electric A-Frame Jack you referenced, part # UF38-944016 would be a good choice for the Keystone Outback Toy Hauler you mentioned. The jack has a 3500 lb lift capacity, which is plenty for the listed tongue weight of the toy hauler, plus anything stowed on it. Among the many features of this jack, I like the fact that is uses LED lamps for long life as well as the fact that a 9/16 inch socket wrench can be used in an emergency...
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. 
Ball Screw Drive MechanismThe ball screw drive uses ball bearings (rotational friction) that offers superior performance over metal-on-metal gear mechanisms (sliding friction) used by other manufacturers. Ball screw drives use less power, have better lifting capability, provide quieter operation, and offer additional benefits.Ball Screw Drive Mechanism

It sounds like there may be a short in your Bulldog jack which could have been caused by excessive moisture from the rain. Also I recommend checking the wiring from the jack to the ground and power sources. The jack grounds through the mounting hardware so you may need to temporarily remove the jack (be sure to support the trailer another way) and sand away any corrosion. Also check for corrosion or damage to the power wire and where it connects to the battery. The light switch...
Bought one to protect the head unit on boat trailer electric jack. Works great. Bought two more to protect our eBike (pedelec) computers on the handlebars of our bicycles. Fits nicely over the brake handles and the computers to protect them from inclement weather. Our bikes sit on an external bike rack when we travel. I had to take apart the computers and use a hairdryer on them after out last two thousand mile trip. Hope these eliminate having to do that and prevent future damage to the computers. 319085
OK, so you have your trailer tongue weight (or a rough idea what it is). What next? If you have a weight distribution hitch that uses spring arms, it's very likely that you will need to raise both the front of the trailer and the rear of your tow vehicle in order to be able to get the spring arms onto their brackets. So not only is the tongue jack lifting the weight of the front of your trailer, it is also picking up the rear of your tow vehicle. 😳
OK, so you have your trailer tongue weight (or a rough idea what it is). What next? If you have a weight distribution hitch that uses spring arms, it's very likely that you will need to raise both the front of the trailer and the rear of your tow vehicle in order to be able to get the spring arms onto their brackets. So not only is the tongue jack lifting the weight of the front of your trailer, it is also picking up the rear of your tow vehicle. 😳
Eliminate the physical exertion commonly associated with lifting and lowering a trailer when you use a Stromberg Carlson 3500 lb. Electric Tongue Jack. It does the heavy lifting for you, and has lots of other features as well. For example, the trailer tongue electric jack has equalizing bars that are easy to set, so you get better results, and two separate LED night lights that provide both added safety and additional illumination. The leg extends up to 23; and although it is heavy and durable, it's also surprisingly lightweight and easy to store.

The cover has worked great. The reason for only 4 stars is that we took preventative measures when it arrived. Many reviews complained about it leaking. We turned it inside out and sealed all the seams. Once dry, we put a plastic bag on first and then this cover. Using both has made a water/weather proof cover to protect the electronics of our power lift. The plastic on its own is not strong enough, adding this cover made the difference.
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