Well, seeing how it has no nails, staples, or major screws (aside from a few small decorative strips, nothing structural) they hold up worlds better than the majority of your traditional campers and even some of your off-road oriented trailers as there's no structural wood or panels to rattle loose or fail. No leaks, better structural rigidity, better thermal retention, better durability to exterior debris and weather, etc. They don't have some wild off-road suspension under them (shock kits are available) but even that has been done with some of them sitting on 5,000-10,000lb axles with beefed up frames and full suspension (some even on Timbren axle-less setups). Check out the work of Texas Customz on the World's Toughest Casita's.
I specifically chose a FGRV for this role due to their attributes in terms of strength, rigidity, ruggedness, durability and improved thermal characteristics over traditional camper construction. There's a reason why FGRV's hold their value so well and are so sought after on the secondary market. This trailer is more than up to task of being used as a light weight off-road camper and others here have used them as such long before myself. I have a full bath, I can fully stand up inside of my trailer without converting the top, I have a full kitchen along with a furnace, a massive AC with a dinette and plenty of storage to boot. It has over a foot of ground clearance, sits on 30" all-terrain tires and has a full steel frame underneath of it's 17ft chassis and it all weighs in at a featherlight 2500lbs.
This might be an overland focused forum but the mass majority of users here use their trailers in the same terrain and scenarios as I've built this one for. Traversing gravel and dirt roads, forest and fire roads, traveling to a trail head only to be left and used as a home base or hub of sorts for daily travel out and back. We've done the tear drop off-road trailer towed down the trail behind us daily thing and it's far from practical or ideal in many scenarios and we found that type of travel is simply not for us.
Very few here are anything more than weekend warriors doing their best to find time to break away in their busy lives a few times a year for a week or so of exploring and getting back home in one piece. If you're looking for around the world travel builds and $250K end of the world rigs that are self-sustaining for weeks on end then you're going to want to ignore 95% of all threads you find on this forum lol. Thanks for your input and concern.