wbwood, we have a smaller Class C and I am the only driver. When we are coming back home from Florida to Iowa our schedules are such that we typically do the trip in a 2 days. It is about 23 hours on the road. If I watch my drink consumption I can do 23 hours on the road in two days, stopping only for gas every 325 miles or so plus the overnight stop. When I do long trips like that my only rule is that I do not travel at night. I am in my early 40's and healthy, so 12 hours behind a Class C is doable for me once in awhile. But I don't think I could do it without daylight. Never tried it and won't. A Class C is not the same as doing a trip like this in a car. It does take more out of you physically. Just ensure you can get a good night's sleep if you are going to attempt two 12's back to back. I've never done three 12's before. I am not sure I could do that.