Who are #'s 3,4,5,6? Are we talking kids or adults? If we are talking kids, don't even think about putting them in the cab with you. #1 they are not gong to want to be in the cab, they will want to be in back watching TV, eating, using the bathroom and just messing everything up.
#2 They are noisy distracting, sometimes annoying, and after about 8 to 10 hours in the seat you will have a bad headache. #3 They don't even care what is going on outside the RV, they just want to be entertained.
Anyway that has been my experience with this subject with kids.
As for adults, good luck, I would say you better come up with some very comfortable seating, or they maybe worse than the kids.
Bill