While musing about what commercial off-the-shelf (COTS) materials could be used to build a trailer box/sail tube (e.g. thin wall PVC duct pipe, rectangular tin ducting, marine plywood w/ resin coating, etc.) I stumbled onto a pic of a 16' aluminum (Coleman?) CANOE, more lightly built than those heavy Grumman "war" canoes...

... and I thought hmmmm... cut off the rear 6', remove seats, leave crossbeams, rivet a sheet of aluminum to the top edge of the gunnels and trim to fit, turn it upside down and bolt/strap it to the trailer! It would be very AERODYNAMIC, and the only remaining problem would be fabricating a locking door. No access from the front end, but oh well.

Once upside-down, the peak of the bow would now be the low point--good spot for a drain plug.

Anyone ever try this? What problems do you foresee? Thanks in advance.