I ended up getting a couple of items that I thought would work for me. The first thing is a 5 to 4 "Combiner/Adapter" According to the package, it provides conversion and isolation for tow vehicles that have separate amber turn signals and red break lights. It is a neat water proof little package with 5 wires in and 4 out. Apparently it has a diode in it that keeps feedback from getting back into the MH wiring, while converting it to the 4 wire connector that is on the Civic.
The other item I bought is a 7 blade adapter that I can wire myself. Now all I need to do is figure out which blades on the Bounder's trailer connector operate the various lights. Then it will just be a matter of connecting the wires.
I will have to get my test meter out tomorrow when I have the time.