Agreed, shouldn't be a hard or expensive job if you find the right person. If you want it done by a true trailer manufacturer that makes nice stuff, Trailer Made does a great job and are local. They seem to be reasonable with their pricing and specialize in custom trailers (mostly car trailers and bases for Tiny Houses).
5340 Tennyson Street
Denver, CO 80212
Its at least worth a call to see what they'd charge. I have no affiliation with them, I just went to look at their stuff when a friend was thinking about getting into Tiny House building and they seemed to know what they were doing and I've read good reviews of their work.