They make great campers out of these type of fleet trucks. I’d like to take one out West to the national parks, comfy enough for a couple nights in the park then you pick up, travel, hotel a few nights and visit another park.
Mine is an RV that has been west and elsewhere as you describe. There is a cult of Sprinter homebrew RV converters
Here is one day on our trip following the Butterfield trail west from Memphis to San Francisco