I'd be impressed if there are any "builders" at all. It appears to be nothing but a concept.
I looked all over their website for some "meat" and didn't find any. No actual camper evident, no details on the truck mods, no details on the camper equipment, no names, no address, no facilities, no allusion to qualifications even, and no delivery promises. Just a few images that appear to be photoshopped, and some slick marketing. Very little investment. I won't call it a scam because I also couldn't find any outright lies.
This sort of marketing just makes me livid. Unfortunately too many people have zero concept of what it takes to design, build, deliver, and support something like this. A lot of expertise and investment is required... not marketing and graphic design!