I always buy the truck I need/want and then match the truck camper/TT or 5th wheel trailer to my truck. My truck has to work along with pleasure.
We've had three 5th wheel trailers all in the 28-32' range. We started back in the '60s with three truck campers. We wanted a bit more room so a 5th wheel trailer fit our requirements and for pulling our fishin' boats. For us a behemoth trailer didn't fit our wants/needs.
Having made a living for several years with one ton DRW trucks I wanted no more of them for a pleasure truck..... mainly because they can't physically go where we sometimes like to go.