JimH has the idea. The heavier TC you have, the greater chance of something going bad on bad roads. A no frills truck camper with minimum features is best. Whether wood or aluminum is debatable. No air conditioning on roof. Smaller tanks advisable because of the added weight. No basement. No popouts. A pop up is best for overhead clearance of trees and rocks, but my bro John has already pulled his 9.5 OUTFITTER! apart on rough roads. Only a few nails were still in along the lower shear wall. The rest had popped out when his '99 Ford frame got the twists and the tie downs were too tight . It is not a one piece box. It is a shoe box with a detached roof. The potential for racking does not help the rigidity or shear strength.
The technique of the driver, ( like knowing where the speed sweet spot is on certain roads; driving on the reverse side and very edge on washboard where the rivulets are facing the best way; trying as much as possible to keep the axles parallel to each other and thus keeping the frame from twisting); build of the truck, and ability to regulate the tire pressure for differing road conditions and constant adjusting of the tie downs to fit the conditions are the best attributes to look for. Most of that comes by hard (so to speak) experience. Most of my experience came from a lifetime of Jeeping which I transferred to the TC. Picking and choosing the route on the Pinion Mountain Jeep Trail, Anza 2004:
'01.5 Dodge 2500 4x4, CTD, Qcab, SB, NV5600, 241HD, 4.10's, Dana 70/TruTrac; Dana 80/ TruTrac, Spintec hub conversion, H.D. susp, 315/75R16's on 7.5" and 10" wide steel wheels, Vulcan big line, Warn M15K winch '98 Lance Lite 165s, 8' 6" X-cab, 200w Solar