Looks nice, Keith. I have one of these in the stash as well. Thinking of making it the 18' P&D trailer for the Dodge L700 as I'm not sure the L700 could actually pull a 36' trailer let alone stop with it!
You can try here: APPORTIONED License Plates - moini.net or here: Welcome to Plateshack.com! Just download, resize & print.
Or if you prefer decals, there are these: US License plates : Zen Cart!, The Art of E-commerce (modeltruckin.com)
I'm not sure about the construction of the raft oars (probably wood), but I don't think people typically wore life vests or helmets back then. Heck, most people didn't even wear seatbelts.