Hallo Marcus,
I do know all the usual shelters (Baetsen, Bombardier etc.) wich are quite expensive. From the Swedish version there is very little known, are they worth a camper conversion (I' ve never seen one from close), how is the insulation and quality of construction?
Do you have some more pictures of TGB conversions? On the internet one only see MAN KAT ,Mercedes (Unimog) or Magirus.
Grüsse,
Walter