I'd suggest looking at Bunkhouse style TT's. Some even have exterior access doors to the bunks. It would be easy to curtain off the re-purposed bunks so you wouldn't be tripping over them.
The key thing to look at is realistic towing capacity for a 1/2 ton truck. Take the max trailer weight and multiply by 15% to get your max tongue weight. Then subtract that amount from the yellow sticker on the B pillar specifying max cargo. The number that remains is what you can put into the truck itself in the form of people, food, and everything under the bed cover.