We just came back from a TC trip from Nebraska, all over southern Utah for a week and half. Up and down and Up and down. Got exactly 13.5 mpg, traveling at 62 mph on the highway with the rig in my signature. We are TC converts now that the kids are all grown. Still have the fiver as it would be great for a destination vacation. But boy it was sure a breeze parking the TC and setting up for the night. I am sure 4 will be crowded at times but it sounds like you are willing to spend the big bucks on a multi slide TC. In that case I think you will be fine. We once to a 5k trip with 3 of our kids in a short box camper with a 10 gallon holding tank. We had a good time but we were cramped!!!!!!! They only thing I think to consider on a slide TC is the ease of getting in and out when the slides are in. I was talking to a fellow TC guy when fishing this spring. He actually regretted the slide on his TC for just that reason. But I am sure most love their slides. JMHO
