Very interesting concept, for just one or two people could be, but no more and pets would struggle to get up that high, but can see it would have it's admirers but not for me, think it will wobble a bit without the vehicle under it, Rick
Started in the good old US of A, I believe. They have lots of pickups and the workers would put the dismountable on the back and use it to sleep in as they crossed miles to the jobs. Once there they could dismount their sleeping accom and use the pick up for work.