If you've got designs of being completely self-contained, with kitchen, bathroom, shower, etc., I am not aware of any campers for compact trucks that include those features.
Most compact truck campers are pretty much just camper-shaped bedrooms, and cramped ones at that. You need to have external facilities for bathing and doing your business.
Remember you want to live like this for SIX MONTHS and travel LONG DISTANCES with this setup. Driving an overloaded truck all over the country and living in an almost primitive setting for long stretches isn't for everyone.