[al]

Just buy a set of heavy duty welded ones like I posted above (in 2019) and they adjust.

[George]

I don’t remember the heights since it has been about 10 years since I had them built. Just raise your coach all the way up, and measure under the support points.

Depending on what I want to accomplish I use fixed height stands or Harbor Freight air over hydraulic bottle jacks, 12 or 20 ton, with the cylinder collapsed down and the center screw post threaded up as needed.

Each has its benefits.