I put one on my trailer last year so because it gave me enough clearance to put a propane bottle on the tongue safely. I love it, they aren't fast, but they are faster than a hand crank. Mine is wired so the truck batteries run it, or if it's unhooked my furnace batteries run it. I have a fourteen inch pull off leg so you don't have to extend it 24" every time. I don't have make or model available right now but I bought if off of ebay for $89. ( would have had to spend at least 60 for a manual, plus $100+ for a horizontal propane tank.) The slower speed in the cold is not the jack, it's a weak battery, mine runs strong, ran full speed after three days below 27 below.
I can hold the button with one hand while hooking up safety chains and unclipping the extension, lock the ball and drive off. No waiting.
Also has a manual crank in case the motor pukes or battery dies.