Since all TCs are not the same, it is hard to answer your question. I have seen a number of the larger TCs being used in campgrounds, off the truck, with no issue. A big wind storm would make me wonder how safe, but that is with any camper. How stable is yours, off the truck, if you try to rock it, while inside, or pushing from the outside?
A pic of the camper in question may help.
Jerry