Well I did not know if there was a reason for the #4 art work seems like a monumental waste of pipe .
I have plans to reconfigure a lot of stuff .I think every system .
even contemplating making a custom black water tank.
How important is the pressure blow off & the regulator?
Like @ least Dual Exterior marine batteries & some solar chargers on the roof and a generator inside with some fancy fabrication to let it do a air exchange for internal & external .
My Sub conscious is hard @ work.