Having a toilet was the "must have" when we purchased our 8' Adventurer camper (model 80W). Shower wasn't essential. We're usually near a creek or lake so can clean up, if needed. If that doesn't work, having a sponge bath with "baby wipes" can be quite effective. The fifth wheel has a shower and we rarely use it, unless we're having a cleanup day at a commercial campground. Again, because we're usually in the bush for a week or so, so use water sparingly.
Because we're usually in the bush without services, we're also usually without access to dump stations or fresh water. So conserving water and not having to dump tanks is important for our type of camping.
Adventurer doesn't make the 80W any more, but maybe take a look at their
80RB, new for 2014. Their webpage says, "This Adventurer 8' Truck Camper fits super short, short and long-bed trucks." Dryweight 1,720 lbs.