This is because they are going down the highway at extremely low RPMs as the truck is use to towing a trailer of 40-60 thousand pounds but the motor homes may only weight 10,000 pounds or less, so it never even breaks a sweat. If you are thinking of buying such a motor home, RV or motor coach, I recommend checking into the Truck Motor Homes first. The motor homes sales market is better than ever. Families and couples from all areas and of all ages are discovering what makes RVing so popular. However, with the price of gas and other items on the rise, it is also important to these buyers that they are treated fairly in a motor home sales experience.