I have done alot of offroading and I think people can underestimate (and overestimate) what a vehicle and trailer can do. Depending on their offroad experience a easy road for some will seem impossible for others.
I have seen 5vers and TT in some really rough area's. These campers all have the axels flipped underneath the leaf springs (stock is above the springs) for extra ground clearance. Rocks and rough terrain are not uncommon for these folks. These trailers are being pulled by 4x4 trucks with mild lifts with a slightly larger than stock tire size. Basically if the truck can make it up the road in 2wd the trailer can make it when in 4wd.