I use my Craftsman 19.2V cordless drill (465 in. pounds of torque), a deep socket from my local hardware store with notches cut in it to match the end of the manual hand crank, a 6" socket extension and this
$3 set of socket adapters for a drill from Harbor Freight. I don't have to have the secondary handle on the drill to use it but it is helpful and since I already have it, I use it.
It is used to crank the tongue jack for hitching, crank the roof up and down, run the stabilizers and the biggest workout: the BAL light trailer leveler. The leveler requires the most torque by far, even with a 14' roof with air conditioner on it. Lithium batteries are best. And the BAL does require a switch in socket size but I have a deep socket unmodified just for it that rides in the utility storage compartment. I should take a picture sometime...