I spent 3 great weeks last summer taking a long route cross the country with my daughter and her two kids (3 and 6) in an Earthroamer XV-LT (NOT stretch). Tons of room in the crew cab for the car seats and unbelievable amounts of kid stuff, and we had plenty of sleeping room. Key was to stop frequently and allow lots of time to run around, and we camped in state parks most of the time. Also key while driving – lots of DVDs in the back seat, Starbucks in the front. Not saying we didn’t all have our meltdowns, but no worse than if we had been hanging out at home together for those 3 weeks.
Kitchen very function in the Earthroamer – easy for 2 kids to brush teeth at once. No problem with the small head, but we didn’t have diapers. Dirty, wet clothes – we stuffed in a Trasharoo slung over the spare tire. Kept everyone’s muddy, sandy shoes in a plastic tub in the head. Strapped a shoe organizer over the closet door, which gave each of us a row of 4 handy pockets for our toys, toothbrushes, sunblock, rock collections. We taped a map to the frig and the kids marked our route as we went.