U2
D-8 has full (well full airline size!!!) toilet which is left over from original pax install, C406 has pee tube at aft end & Islander has plenty of scenic spots to land for "rest breaks"
For those who haven't tried this kind of flying and are considering it, it has to be the best fun flying you can have in GA (and I've tried quite a bit of GA). Have a crack at it and have some fun!!
Cheers
Bendy