I have an electric jack on my 32 ft Jayco that I have used for 7 years. No problems and it works great, a pleasure to use. No more cranking jack handles up and down to load and unload the hitch. It is made by H&H engineering and is a high torque jack.
I would highly recommend this jack. I do take the pressure off it by using the trailer jacks to support the front of the trailer when not in use.
When I bought my trailer, they were going to give me 2 high end lawn chairs and I said I also wanted an electric jack. They threw that in instead of the chairs!, great deal. Bought my trailer at Ardell Brown in Salt Lake City, but I believe these jacks are available at any rv store. Retail was $250 for this jack, they had a lighter weight jack for a bit less. Depends on your tongue weight. I haven't seen or heard of the Atwood, but they make pretty good water heaters!
If you want more information like the model number or anything else, I can look it up so just pm me.
Also, do you suppose a dealer would take an electric jack off a trade in to sell to make a few bucks? Might explain the used jacks for sale. Wouldn't put it past them!
Bill James