A trailer tongue jack is designed to lift the front of the trailer, so you first need to know how much this is. The most accurate way to determining trailer tongue weight is to, well, weigh your trailer. Or you can spitball by figuring out what 15% of your trailer's maximum weight is, as tongue weight should be no more than 15% of the weight of your trailer.
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. 
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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


Take the effort out of lifting your trailer with this electric jack from Stromberg Carlson. The sleek black jack features an LED light for nighttime use, as well as water-resistant switches trailer's A-frame - hardware included Rust-resistant, powder coated steel parts are strong and durable Jack cover is made of vacuum-formed plastic for extra protection from severe weather Zinc-plated steel
The sealed, maintenance-free, 12V motor on this electric jack maintains high speeds, even with heavy loads. Extra-large, articulating footplate prevents sinking. Remote control has a 10' long Features: Electric landing gear jack lets you quickly and easily level and stabilize your trailer when used as part of a set Single-speed, 12V DC motor maintains a high speed, even with heavy loads
It sounds like the Bulldog A-Frame Jack, part # BD500200 is just what you are looking for. The BD500200 has an outer tube diameter of 2-1/4 inches which matches what you are replacing and this jack has 2 toggle switches. One is used to control the up and down movement of the jack and the other switch turns the LED lights on and off. The mounting plate features mounting holes that allow you to mount it so the controls are at the front of the jack or mount it so that the controls are...
Replaces the bottom housing kit for Husky Brute Series HB4500 and HB4500R electric trailer jacks (HT87641 and HT87247). Kit includes covers to protect both the gearbox and the motor assembly from Features: Replaces the bottom housing kit for Husky Brute Series HB4500 and HB4500R electric trailer jacks Fits HT87641 and HT87247 Included covers protect both the motor assembly and the gearbox
Keep your trailer in line with this system that uses a telescoping bar with friction pads to correct trailer sway. Built-in grease zerks in the head provide simple maintenance. Includes an adjustable maintenance Powder coated steel resists corrosion Snap-up lever eases hookup by reducing lifting required by trailer jack System includes head assembly, adjustable shank, 2-5/16" hitch ball
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