You may have already seen the other STREAMLINE trailers around here. As that company was a break-off of SILVER STREAK you may find info of use there as well. All the brands (and to include AVION) were still of a singular character in the early 1960's, one can almost feel it. This fades by the early 1970's and the usual MBA-initiated "cost savings".
Enjoy what you have, take your time (planning), and don't get discouraged.
Since you're nearby, take a run over to CAN AM RV and talk with Andrew Thomson about the best tow vehicle. Economy and safety can go hand-in-hand.
site has plenty of old brochures and advertisements. Collect all the technical specs you possibly can.