Six years ago I ordered a new, all aluminum, enclosed, 18ft custom trailer from Aluma, with insulated walls and ceiling, escape door, LED lighting, 120v plugs and hook-up, e-track on the floor, beavertail and a
built-in winch (with synthetic rope) with remote control. I also had it made 6 inches taller than their standard enclosed trailer to accommodate my taller than usual Model A.
Here's a view of it from the rear:
18 feet is plenty long for what I wanted and with the V-nose up front, that gave me the extra storage space that I wanted, without needing a longer trailer.
Since I use it primarily as a storage "garage", the 120V plugs are great to plug in a compressor, other tools, a heater, a dehumidifier, as well as a battery tender) for the 6V battery in the car and for the 12V battery used to power the winch and lights) and the LED strip lighting is super so that I can work on the car in the trailer at all times of the night. The remote control wireless winch is great so that I can move any cars into and out of the trailer by myself, while sitting in the car to steer and brake.
Brad in Maryland