Shelter configuration

[Magicvehicle]

Moin zusamen! I would like to share a sketch of how we plan to build our refuge.
We have many doubts and we would like to hear opinions about it.
Would it be more interesting to do 6x2'40x2 than 5'50x2'40x2?
We want to live in the truck the rest of our lives!, it's not just for vacations.
Does anyone know any better configuration to take advantage of the space?
What wheelbase do I need for a 5'5 meter box?
What complications does a chassis of 4.80 meters of wheelbase have for driving in this sector?

I noticed that the manufacturers as bimobil, krug xp, etc work with very long 4x4 chassis, this does not affect the driving in complicated places? Greetings and thanks for your time!