Wheels under the body
The most comfortable way for easy loading and unloading. Wheels under the body make the loading easier with the forklift, because every sides is openable.
Possibility to get close to the sides because the trailer become the platform.
Moreover, while the car is riding, the wheels go on the same track as a car, this is the easier way to go via the narrow streets.
Although the load is higher than on the usual trailers and it’s simple to unload it.