I converted my flat bed trailer to give me more storage . Not the most aero design , but it works well .
The only regret.. its now just a tad short so considering lengthening it .
Also a little lower would have been helpful as I have to carry extra ramps to get my cars off . I run around 100mm ride heights .
Even with extra ramps I still jack up the trailer at the tow bar when loading.
The storage areas allow me to carry a large amount of "stuff" to the track and it has been designed so that I can install a vice and have a small workbench, but have yet to finish that part .
Installed Duro Torques Axles Duratorque Suspension - Trojan Trailer Parts & Components, trojan, trailer, component, duratorque, suspension, hub, brake, braking, coupling, towball, wheel, jockey wheel, flag bag, load leveller, wheel lamp, brake controller, wheel mount, leaf sprin
and travels like a dream , even with extra weight over the back wheels .
8 Tyres/ Rims can fit above the front of the Car
I went with a Warn 4700 winch https://www.warn.com/utility/dcwinches/DC4700.shtml
which is great , but I have the wire rope which is pain , suggest nylon would be better.
Tread Deck alloy on the base .
I use tie downs front and rear that go through the wheels and pull against each other , plus use a tie down from the roll cage to the front of the trailer as a fail safe. Never had a problem.
Its just possible to see the side car on the trailer in the rear vision mirrors , but you can't see much of it , which is a bonus , nothing worse than crashing your car and then looking at it all the way home on the trailer !!!