That's all the manufacturer designed it for. (The spec sheet says 40*) And, yes, I agree it should be more. I believe 45* is marginal and is the angle of repose for a lot of materials so a few more degrees would be best. Up until this load, I've not had a problem. The shaker idea is really interesting and should be easy to do.In
Why does your trailer dump only like 45 degrees ? It should dump 55 degrees at minimum, some trailers dump even 70 degrees.