I thought I'd post an update to this thread. I found another pop-up camper that will fit the H3T. Phoenix Pop-up campers
:link:, "All campers are custom! We build our campers from the ground up to fit your vehicle’s model, make, and bed size."
I emailed them and they estimated that the camper for the H3T with all the optional features (expect under-bed storage) would weigh ~850 lbs. I like this approach as an alternative to a roof top tent (RTT). The pop-up camper is easier and quicker to set up than a RTT. You get a queen sized bed inside and even though you're sleeping at about the same height, the climb into bed doesn't seem as high since it is done in two stages (1 climb into the truck, 2 climb into bed). I could put a porta-potty inside at night and my wife and I wouldn't have to go outside to do our business. You can add an insulation blanket o the tent portion and heat camper better than a RTT. Also, there is an area where you can stand-up inside to change clothes, ... OTOH, a roof top tent would be lighter and the low branch clearance would be better.
Unfortunately, it uses a lot of the H3T payload weight (I'd probably need overload springs in the back) and since I can't get a used one that fits the H3T, I'd have to pay full price. All the rock/gold hunting gear that I normally carry in the truck bed would need to go inside the camper (and would be in the way when we are camping) or I'd have to get a cargo trailer.
I figured if I'd need a trailer to haul gear, why not get a camping trailer and leave the gear in the truck? Once I get to where I want to park the trailer, I could unhitch and I'd have my mobility back. With the camper on the back it would be harder to leave the excess weight and height behind.