The safest default for Route 66 is a camper van, Class B van, or smaller Class C motorhome. Those vehicles are easier on old alignments, small-town parking, fuel stops, historic districts, and campground pads than a large Class A or long trailer.
A larger motorhome can still work, especially if you stick to more modern connectors and book full-service RV parks, but it changes the trip. You will spend more time checking turnarounds, parking, pad length, fuel access, and whether a historic segment is worth driving in that vehicle.
Best for couples or two travelers who want easier parking, lower stress in towns, and flexibility on short stops. This is the best fit for users searching camper van Route 66, Sprinter-style camper vans, or compact RV rentals.
Best default for families or groups who need fixed beds, bathroom access, storage, and a familiar RV layout without going too large for Route 66 towns.
Possible for experienced drivers, but less forgiving. Choose larger RVs only if you are comfortable skipping tight historic segments and booking campgrounds by exact vehicle length.