Larry,
I have a Sloan Kwik Load trailer and I think it could be the answer for you. My Viper is lowered about 3/4 inches and I can still open the door when the car is on the trailer. It's close but it does clear the fender. The nice thing about these trailers is when you load the car; the fenders are never in the way (they slide out of the way). I also load the Z06 sometimes on the same trailer and I have to remove the fender to open the door after that car is loaded. This is not a big problem; the trailer has aluminum fenders that come off with two wing nuts. On and off in a couple of seconds. Hope this helps.
Dale