RE: cheaply made trailers -
When I rented an enclosed trailer to haul the RR I purchased last year from SD, the floor seemed thin & barely supported the car.
It had a V nose, and it seemed that aero wash off big trucks affected the trailer and wanted to pull the Excursion we used towards the other vehicle.
Never had that happen with a flat-nose. It was pretty disconcerting.
I think it was a Wells or a Pace, don't recall. To be fair, the trailer may have had a fairly hard life, but still...