Something else to think about is the east/west bed or north/south bed.
29 inches of head room I would rather roll out of an east/west bed.
Seams. Not sure if Hallmark construction has no seams but even if it does have seams, water intrusion is not going to damage it as bad like a wood frame camper. Think the frame is all fiberglass over on a Hallmark
I'm not talking down North Star or his brother Bundutec. They are strong well built campers, but you will need to pay attention to seams on any camper. Especially a wood framed one.
Four Wheel that someone mentioned are good off road campers. I have read the condensation is bad since it is aluminum framed. Would need to crack a vent in any camper but you might need to open it a little more on a Four Wheel. Might have to do a little more wiping down the soft wall in the mornings