Boat trailers of the Harbeck brand with slip wagons that can be opened via folding rails. So the wheels can remain mounted.
The slip car has fixed supports for a round frame dinghy - I use it for my Finn dinghy. So that everything is a little easier, both the slip car and the trailer are equipped with a nose wheel and on the trailer a belt winch is mounted on the drawbar, with which the slip car is pulled onto the trailer in no time.
The electrical system is perfect and has a 13-pin connector.