Don't short change yourself on the Truck. While a 250/2500 may work for the 5er you're looking at now, if in a few years you decide to go bigger you'll be looking for a new TV for the bigger RV. We were only looking for a 2500 a few years ago, but couldn't find what we wanted, but the Dealer had a 3500 Diesel Dually with all the options we wanted and for a better price than ordering a 2500. Didn't need that big a TV at the time, but when we decided to move up to a 5er we weren't limited by our TV. Just something to think about since you don't have a TV yet.