Here are the brackets I use.
https://www.sawhorsebrackets.com/
Not cheap but they can support up to 4000 pounds, uses a 2×6 across the top and disassemble quickly for storage. I made the legs shorter so there would be less stress on the brackets themselves and have the jacks touching the ground for stability.
I never travel with jacks so, while I never camp in it off the truck, I do go in to do maintenance and its rock solid. If you need an actual picture of the camper on the saw horses, let me know.
Cheers
