I couldn't say for sure about what happened to the stabilizers but I have a pretty good idea.
The PO parked it there under the house about 4 years ago and the stabilizers weren't in that condition at that time. They had to let half the air out of the tires in order to get it to fit under the house. They never filled the tires back up and the rest of the air must have leaked down over time causing the AS to settle onto the stabilizers. Those stabilizers are not designed to support the entire weight of the trailer, just stabilize it from rocking. The jewelry shop equipment that was stored inside wasn't too light either so that didn't help things any.
I'm betting the axles are probably going to be shot as well given the vintage. That's one of the first issues I'll be addressing. If they've gone positive (upward torsion arm angle) I'll see if the PO will let me swap them out there on his concrete driveway before towing it.
I PROBABLY could make it home with bad axles since it's so close and it's only slow, straight back roads to get there. But with my luck, I'd be the guy that didn't make it home and you'd never hear from again.
Better safe than sorry, even if it costs me more up front or takes longer to get it home.
Andy @ Indland RV - Could you PM me a quote for a pair of new axles for a 1973 Soverign 31' Land Yacht? Shipping would be to a commercial address at zip 78336. Just in case...