I have a very early model 5.7 Truck Camper mounted on my mid-sized Dodge Dakota. This is well-built but "cozy" model.
I added a porta-potti for obvious reasons and a small water pump to give better water flow than the original hand pump. Lots of added wall hooks etc. to keep stuff out of the way.
These are well-made models that exactly fit the bill for someone seeking "simple" and avoiding the purchase of an F-250 or larger model that seems to be almost mandatory these days.
My wishes: Aside from a small electric heater, there is no heating in the camper. The electric heater does warm it up at bedtime, if you are in a spot with 120v. Big omission is any way to cook inside. I am still researching that topic for future upgrade.