One must define off roading..There is off the pavement on gravel and dirt roads,then there is off roading which is off any maintained road which the majority ot truck campers here can't do anyway because there to heavy/to wide/to tall and to long..
I traded in my short Class C with great ground clearance, because every trip seemed to pop a seam, being built off the frame..I am not having that issue with my TC in the bed of the pickup and it only flexes with the pickup bed.
Something like the Mcgruder road, from Elk City Idaho to Darby Montana through the mountains on a primitive un-maintained road, might define off roading..It is a road but a terrible road..