If you are planning on towing anything other than a car or small truck behind your trailer, you have no other option than to carry it on a trailer. Many people also prefer to carry their auxiliary vehicle on a trailer to reduce the wear and tear on the tires, suspension, and transmission. The weight of the towed vehicle plus the towing equipment, plus the loaded weight of the motorhome cannot exceed the gross combined whole weight rating of the motorhome. This is why you will generally not see anything smaller than a large Class C motorhome pulling a trailer.
You may see enclosed trailers being towed behind larger Class A and luxury bus-conversion RVs as another (though expensive) option for towing. Once again, weight becomes an issue. An enclosed trailer will weigh more than a flatbed trailer. Cargo carried on or in the trailer will need to be secured to keep it in place while traveling. Enclosed trailers will help protect expensive vehicles from damage caused by road hazards such as rocks and other debris.
These flatbed trailers and enclosed trailers have a rear door that folds down to provide a ramp to drive your vehicle into the trailer. It still requires some driving skill to center the vehicle properly in the trailer.
If you are considering towing a flatbed or enclosed trailer behind your motorhome, be sure to get one that meets your present and future needs. Will that trailer that your BMW sports car travels comfortably in be the right size for your SUV if you need more passenger room on your next trip?
If you are one of those lucky RV owners who can afford those large luxury bus-conversion rigs, you might want to think about color coordinating your entire setup. You can have your enclosed trailer and your vehicle painted and detailed to match your rig. It also makes a nice package when the time comes to sell your equipment.