vetteman... There are any number of people on this forum that could modify that trailer for you, including me. But, I agree with Kevin... You could prolly get a custom Harley hauler/travel trailer built for less than what a vintage restored Boles-Aero Miramar is worth. And, of course, you wouldn't have to put up with the purists that were aghast at what you had done to an antique trailer. For that matter, quite a few people have just modified a new cargo trailer with camping facilities in the front and Harley in the back without spending big bucks. If it were me and I could get that fine old trailer at a bargain... I think I'd still just polish it up and sell it to an enthusiast for a nice profit and go have a custom one built.
~ Brick