I bought this in Vermont, which doesn't help out very much. This is a good general idea of what I have found to work very well. I even bolted on a lockable toolbox for the cover and tie-downs. This particular model is used for three motorcycles and that is why the rear folding ramp goes all the way across. Note also that the Morgan's bottom is very low and that one has to jockey the ramp/trailer combination in order to produce a gentle slope, otherwise the middle of the body will scrape or even get hung up.
http://www.andersontrailers.com/Images/trailers/MT712.jpgThe front windscreen really helps to stop the road debris being kicked up by the tow vehicle.
Please do not put a cover on it while towing! The cover will just flap in the wind and beat the M3W! I use the tonneau cover while towing and put the whole vehicle cover on for over nights and while parked.