I gotta ask - what is it with lowering the camper to the ground with the jacks? I mean seriously why? All it takes is a couple of sawhorses, is there a legitimate reason why everyone wants to crank them all the way down like that every time they unload? I think I'd tire of that real quick.
This probably isn't the answer you're looking for and depending on where you store your camper may not be a viable option but this is how I do it.
I use a pair of 34 inch high sawhorses that, combined with the jacks, support the camper rock steady at loading height. To unload I run all jacks to the ground with a light weight cordless drill. Five cranks on one of the front jacks and five cranks on the opposite side front jack (run same side rears down consecutively with drill) drive truck out, slide horses in and lower. So I never do more than 10 cranks by hand total.
An additional benefit is you don't have to duck when walking under the cab over.
Loading is same routine, takes virtually no time.