Hi Mike,..
I have often wondered about the wings rubbing on an enclosed trailer too,..but ,,there is one thing ,..most states will let you haul a load up to 10 feet wide ..with out a permit,.or an escort,..the limit might be...in some states ..daylight hours only for transport,and some states do not allow any over size load to be hauled on week ends..or holidays.
the load must be placarded..with "WIDE LOAD" so if you did build a custom trailer wider then the allowed 102 inch,.following those guidlines you might be ok,.. first I would check with DOT in your state,.ask them how to contact the permit office for oversize loads and limits,..they can answer the question best for your state,
what I have said here is generalized ,..I have only transported over sized loads from Maine to florida and from the east coast states as far west as Indiana , luoisiana.
I havent hauled any in Colorado .

I have seen trailers for sale on the kitfox web site as well,..you might want to contact John at kitfox to see if he might be able to help you.

hope this info helps you out


Chase