Your 1983 model probably had only THREE jacks, which were the type that mounted underneath the side overhang (aka wing) of the camper. It probably didn't help that that old camper's frame was fatigued from age/use, and possibly somewhat rotten from sitting outside.
AFAIK, every camper manufactured nowadays has FOUR jacks, which are mounted to the corners of the camper for a much stronger arrangement. For sure the Palominos have been this way since 2000.
A bit of advice for loading/unloading, if you are "jolting the camper" at all, you're doing it wrong. If you are not free and clear, you need to stop and reposition. Forcing it is a sure recipe for disaster.
Don't worry about the so-called Palomino "quality problem." The camper won't be perfect; no new camper is. You're paying a low price for the camper so you can't expect exotic materials and old-world craftsmanship. What's important is that the camper's weather tight, and its functions, function. Beyond that, take care of it and it will take care of you.
Putting 10-ply tires on half ton trucks since aught-four.