I own/have owned vans with both concepts. Insulating a cab is impossible. Due to its large windows it is a major heat source in summer and always cold and wet in winter. Having a solid door between cab and cabin has one additional advantage. The cabin can be much better secured against break-ins than the cab. If you ever think about international overlanding or shipping this is quite relevant. But on a nice day it is great to sit on the comfortable turned front seats (much more comfortable than the dinette) and look out through the huge windows in the cab. Therefore my camper used in the first world as a 3 season camper has the cab integrated. My camper I used for overlanding in the 3rd world in all climate zones had a solid door between cab and cabin.





