I have a drawer system in my Patrol, and when I lay my rear seats flat the top of the seats and the drawer system are level. If I sit on my ass on the drawers my chin will sit on my chest, add to that a minimum of 50mm of thin camping mattress ( which I'm guessing you will definitely want thicker, it will become very uncomfortable to manoeuvre to even climb into a sleeping bag or bedding. The taller you are the more this exacerbates the issue.
The other problem them becomes ..... where the heck do you put the fridge and more importantly the Klipdrift Premium......hahaha
Nissan Patrol GL 4.2 Diesel Turbo (Iron Maiden)
Nissan SANI 3.0 V6 4x4 (SOLD)
Isuzu KB 280 DT 2x4 ('ol Smokey) - SOLD
Suzuki TL 1000R "V twin" (Growler) - SOLD