Upgrading from popup to 80RB

I am also interested in this camper for its small size and light weight. Of course with that are the trade offs, the main one for me being the small tank sizes. Does anyone know if it is available with a cassette or composting toilet? I could carry some extra water in the truck and camper and the cassette toilet would alleviate the small black tank.

OP, what makes you want to get away from the pop up? I love the idea of a pop up but can't stand the soft sidewalls for noise and the conspicuousness when trying to stealth camp to catch some z's on a trip.