2014 Can Am Spyder RT & 1999 CSC Escapade Trailer - need wiring HELP!

[wingnutlori]

Last year I bought the Spyder. This year I bought the trailer. Of course, they aren't wired with matching plugs. I talked to a local trailer shop, and the guy recommended that I get the Show Chrome Plug n Play wiring harness to replace the trailer wiring on the bike. I bought one ... it doesn't have a trailer side plug - that needs to be wired on. I can't find a wiring diagram for the Spyder.

So here's the thing: spyder has a round plug installed.
The trailer has a rectangle plug.
What would y'all recommend I do to get the two units talking and playing nicely together? I have no idea what to do with wiring!