Welcome, Mike!
You have landed on a trailer forum, all-molded
fiberglass trailers, specifically. We have a few former truck camper owners here who might chime in with some helpful advice, but you’ll likely get more responses on a truck camper forum.
The issues are definitely more challenging with a truck camper. Rear mount seems best for aerodynamics and ease of loading. I’ve seen a number of truck campers with that sort of gear hanging vertically on the back, but I didn’t look to see how it was mounted.