Hey Doc n Rev,
I've Built a Few Trailers, Buses/campers and have assisted in a few others for Drag Cars n Bikes,,,
A few thing I'd build into my next Trailer,,,
Solar Panels for lighting, Google BP solar and or camping joints in Melbourne,
Build retractable awning beams into the sides of the trailer, bought ones can be a tad pricey its better to make them..
have a cassette BBQ plumbed into the side.
Don't use checker plate on floors or ramps it gets really slippery when wet and if you have oil residue on your feet,
Barn Doors that lock open with retractable ramps, every one trips over ramp doors that are left open,,,
100mm x 6m lengths of Pipe mounted under the floor hold 47 litres for Air or water awning poles??
Or if your welds are good use chassis as an air reservoir.
Build the trailer the same height and width as the tow vehicle for economy and reversing ..
Leveling jacks and jockey wheel so the trailer can be left with out a vehicle attached,
A sound proof compartment for the Gen set, Air compressor,
heavy duty Stainless steel hinges and locks, concealed floor attach points for toolboxes and cars,
Use a Treg Hitch made in Adelaide, like a universal joint has no yackedy yak when towing.
I would work on vehicle on the awning side with flip up side exposing the wall mounted tool box and drop down work bench, retractable air lines and hard wired LED lighting system. Use LED's for everything. no solder joints in any wiring Trailer and Race Cars,,,
Your Race Car will suffer more damage and wear n tear from the trailer not racing...
Most important insulation Air conditioning. LOTS of compartments..
lots of planning......