Although I appreciate your experience, off road worthiness has nothing to do with most of what you posted.
My choice of truck for example doesn't have anything to do with the construction quality of the T/C for off road use. The T/C is either constructed well for off road use, or it's not (or it's some point along the line). How many days I'm going to be in it has nothing to do with how well it is constructed or will hold up to off road use. You can pick any number, say 300 days. Which T/C will hold up better to the same 300 days of use?
If you look at a 6' or 6.5' or 8' (doesn't matter the size), which T/C is better constructed for off road use. What I'm trying to get away from is all the superfluous information that gets asked or offered when an original question gets asked.
My age doesn't influence whether XP is a better off road camper than an ATC or FWC. It might impact my choice for purchasing, but it doesn't speak to the original question(s).
A question such as, "if you were to rank the most off road worthy in-the-bed truck campers, what would that list look like" has an answer, not another list of questions or comments. Certainly there is a "because" for each listed T/C (i.e., one is aluminum and flexes vs. wood with wood screws), but something like how much you want to spend doesn't change the off road qualities of the camper. It limits which a person might choose once they look at the list, but a gold plated toilet (i.e., expensive) isn't going to make it better off road.
Sounds like the list goes something like:
1. XP
2. Something else
.
.
.
.
... Outfitter
So, answer or not I guess.