The longest RVs on the road are class A motorhomes and fifth wheels. Class A RVs can be up to 45 feet long, and if you include the towed vehicle behind it they can be 60 feet long going down the road. Fifth wheels max out at 45 feet, but remember you'll also have a 25 foot+ truck also to park and maneuver. If you add in the length of a tow vehicle or the truck pulling a fifth wheel, RVs can give semi trucks a run for their money. If a large toterhome is pulling a 30-foot trailer, we could see lengths of 70 feet or more!