This is my direction fer the trailer belly pan. I know I can't have it this way because when the wheel swivels around when I'm backing up, the tire will crush the belly pan. It's possible to build a hinged cover that moves up when contacted by the wheel and lay flat when traveling forward...
![](http://i677.photobucket.com/albums/vv131/BZP2/Aerodynamics/Boat%20tail%20trailer/IMG_4309_zpsf123f8a6.jpg)