trailers with canvas covers

[george davidson <geodav-lou@worldnet.att.net>]

I've just purchased an open, all aluminum trailer which I would like to
make/have made a lightweight frame over which a canvas cover could be
installed.  Any tips on doing this appreciated.
I like the enclosed Hallmark that I have, but it's heavy and doesn't
have a very efficient aerodynamic design (understatement?).