I've toyed with the idea of a trailer off and on for a long time yet if I can't fit all my gear in the bed of my tank of an old truck I'm hauling too much stuff.
The motorcycle trailer is kind of morbid. That being said, if your into it most of DW's guitar cases are coffin cases. I'll attest to how tough they are. Buy one of the bigger models for a couple hundred bucks and build a little carriage with and axle and wheels for it. I bet it would stand up to it. Parts of their site aren't exactly work friendly. Nothing "dirty" but the coffin girls don't exactly wear a lot of clothing. coffin cases