camper support

a good point. I'd just make the stands the minimum height that you need to do your work.
bumpy

For what you're doing, I'd be more comfortable with the camper set closer to the ground. Especially if your repairs will require that all four jacks be removed at the same time. The X supports look like a good idea for stabilizing the camper at about the same height as when it's on the ruck. I think that was the inspiration behind their design; to reduce the amount of jacking required. I don't know as I'd be comfortable with using them as the sole support.

I'm working on my camper right now and have the rear jacks off. The camper is sitting on two sets of heavy duty jack stands, with a 4x4 laid across the top of each pair. The front jacks are down, but lightly loaded. The rear bumper on the camper is about 6" off the floor. The repairs I'm doing have required pushing, pulling, hammering, and crawling under the camper. Whatever you use, make sure it's stable enough for the work you need to do.

:):)

what is the construction of the bottom of the TC? I'd be more confident if a piece of 4 x 8 plywood was resting on those supports.
bumpy

Assuming the plywood is 3/4" thick and each of the 4 pcs is 4' long, that spreads the load out on something like 12sqin of wood.

The first google hit tells me wood (altho this is for solid wood) compressive strength is at least 4000PSI. So that arrangement in solid wood would hold a 48,000lb camper before failing in compression. Even if plywood is half of solid wood's strength, you still have a wide safety margin.

The half lap joints have to fit snuggly enough to keep the sections vertical. A sloppy fit which allows the "X" members to lean away from vertical will change the load and failure mode.

popeyemth wrote:
id use concrete blocks laid with the center holes vertical.
they hold up houses........

Right after they are filled with concrete and steel.

.

I need to pull the back two jacks to do repairs to the wood behind them were they bolt, that's why I need to put all the weight on the plywood

I've use that design on my 3000lb camper with no problem. I would put some weight on the camper jacks.