I am about to start building a new dump trailer and I have been looking at others designs for detail info. I have seen both the straight ram and the scissor lift styles, but no manufacturer can give me a consistent answer as to which is better. I am guessing that the Scissor (single or dual ram) is stronger as i see it more often on larger trailers (over 7K gvw), but I have seen some 21k's with straight rams as well as the 10 wheel kenworth dump i used to operate had a straight ram. Any opinions, is it just cost related or maybe manufacurer preference or is it based in duability? BTW i am making a 10K-16K range dump (not finalized on the size yet). more than likely a 9,999 to keep under class A and to avoid the $850.00 perm plate.