Have no fear! Two simple steps!
FIRST, check your camper manual or BETTER YET, call your camper manufacture and see if your TC model year can support a full tank of water off the truck. I say call, because my manual says no, but a call to the manufacture said yes, as they had not updated the manual for the newer campers. And model years can make a difference.
SECOND, if I know what campground I am going to stay I simply call them and ask there policy regarding taking the camper off the truck in their campground. Campground rules differ in the same city, literally across the street from one another so there is no one hard and fast rule for ANY particular State, County, etc.......
I an sorry, but I don't carry ANY other supports except the 4 jacks the camper was DESIGNED to be supported on. No bricks, no two by fours, no sheets of plywood, no trailer jack stands.....are we not carrying enough already? Why in the heck do you think TC's cost so much per sq. foot? It is called ENGINEERING.
I do have, however and highly recommend the Torklift Wobble Stoppers only if you have dually brackets as they take away that bit of slop the brackets introduce.