A tow dolly is a type of trailer designed to transport vehicles with two wheels on the ground and two wheels on the dolly. It typically features a ramp for easy loading and unloading, making it suitable for towing cars, trucks, or SUVs behind a motorhome or pickup truck. Tow dollies are often used for long-distance travel, allowing drivers to bring an extra vehicle without the need for a full trailer. They are generally lighter and easier to maneuver than traditional car trailers, making them a popular choice for those who need to tow a vehicle occasionally.