AnEv942 wrote:
Curious material the block is made of.
I assume this 'cube' swagged in top of inner (black) tube as in Kkellers14k pic. Hopefully Happijac works with you on this
There is a plastic guide (or dirt scraper or something) right at the top of the tube. The crimps are about two inches down, you can see them dented into the tube on all sides. Those are what's holding your camper up. Inside of mine (again many years ago) there was a brass or bronze ACME nut fastened to a square steel plate captured by the crimps.
BTW those Trojan saw horses are the Bee's Knees! I've put a whole unit of plywood on a set (maybe a bit over a ton?), they didn't even flinch.