Figured I'd add this
The wagon + Enclosed is me.
Mileage sucked (29.9mpg @ 65 mph) but to the best of my knowledge that is the first time that this trailer has been towed and gotten double digit MPG.
With a big load, I'd insist on brakes, but I had an incident where a guy blew a stop sign to make a U-Turn at a No U-Turn sign and I had to emergency stop, it was way better than I expected, better than some stock cars that I have driven while not towing.