The best size dump trailer depends on your needs and expected use case.  For example, if you are moving large boulders, you might need 1) a small dump trailer 2) with a thick floor, 3) and a large GVWR.  If you are moving discarded shingling, a large high side dump trailer is better.

Here is a dump trailer buying guide.  And use our filters to find the best dump trailer for your needs.