This article was originally published in the Britannica Book of the Year, an annual print publication that provides an overview of the year’s most-notable people and events. Unlike most articles on Britannica.com, Book of the Year articles are not reviewed and revised after their initial publication. Rather, they are presented on the site as archival content, intended for historical reference only.
Extreme Max BoatTector all-purpose buoys are designed for Extreme Max BoatTector all-purpose buoys are designed for use in most marine conditions from high seas to calm lakes. Versatile design is perfect for use as a marker buoy in most applications. Constructed of UV and chemically resistant PVC. 2-year limited warranty.  More + Product Details Close
Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-One connector plugs directly into OEM tow package wiring harness - no cutting or splicing required. Powered ModuLite reduces strain on wiring system. vehicle's wiring matches that of your trailer Powered module connects directly to avoid overloading your vehicle's electrical system Constructed of 16-gauge bonded wire Comes with dust cap for 4-way flat
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. 
Back up your vehicle to the coupler of your hitch. Center the ball directly under the coupler (duh, right?). Lower your jack down so that the coupler connects with the ball and you raise up the jack up until it can't go up any more.  (Don't raise jack all the way up yet if you have a weight distribution hitch that requires you to lift the hitch as well as the back of the tow vehicle.)
Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-One connector plugs directly into OEM tow package wiring harness - no cutting or splicing required. Powered ModuLite reduces strain on wiring system. vehicle's wiring matches that of your trailer Powered module connects directly to avoid overloading your vehicle's electrical system Constructed of 16-gauge bonded wire Comes with dust cap for 4-way flat
We highly recommend getting yourself an electric trailer jack. Marshall has always had one on his Lance, and Kelly just recently got our #1 recommended Husky electric jack after almost three years living with a manual jack, and she couldn't be happier. For Kelly, it was one of those "Why didn't I do this a long time ago" reactions. Oh well, nothing like living in the present and not bitching a fit every time you have to hook up! No more worries about Kelly's back going out because of her jack. Her back is jacked, but her back won't go out due to a jack. Something like that. 
This article was originally published in the Britannica Book of the Year, an annual print publication that provides an overview of the year’s most-notable people and events. Unlike most articles on Britannica.com, Book of the Year articles are not reviewed and revised after their initial publication. Rather, they are presented on the site as archival content, intended for historical reference only.
The best jack is extremely relative, and is dependent on many factors. The Etrailer.com Electric Jack w/ Footplate - A-Frame - 25-1/8" Lift - 3.5K - Black # EJ-3520-BBX will work very well for your 3500 lb dry weight travel trailer and has an excellent price point for this type of jack. It includes a 5-5/8 inch inch drop leg to allow faster extension and retraction and utilizes 2 switches for function; one for power and one for raising or lowering the jack. It also has LED lights to...
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
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...
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. 😳
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.
Use this electric tongue jack to lift your trailer with the flip of a switch. The sturdy steel jack can handle up to 5,000 lbs. It has 18" 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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