....these genre of truck campers are made onesies and twosies. Custom.
Not many out there.
The only truck camper cohort likely to buy something like this are global expeditioners (who frequent Expedition Portal). In fact, I have seen several of these Kimbo units for sale on the used market in the US. They sell in the $19,000 USD range used....
At my last count, there were 11 exotic expedition truck camper manufacturers making specialized units in the USA (my last count was ~4 months ago)....