Well overdue feedback for RCP, he made me a custom dump bed earlier this year for my semi-trailer project.
Build thread with pics of his work here:
http://rctruckandconstruction.com/showthread.php?t=9045
The project is still WIP but I'll post some more pics soon.
The dump bed is a totally awesome job, quick turnaround and absolutely no dramas during the build process. Communication was great, with pics of progress all the way to check it was as I intended. The guys at my local club where really impressed with the quality.
Absolutely no hesitation in recommending for anybody wanting a dump bed for rigid or semi-trailer