I have a 1980 Suzuki GS100G I have a windjammer, side bags, and the vetter trunk, keeping it simple as possible. would a single wheeled trailer be better, or are 2 wheels better. any opinions would be appreciated.
I don't know the GS1000 frame, but on the Goldwing, the trailer hitch replaces the rear "bumper" to the stock saddlebag crash guards. I made a hitch once but never used it because I was give a crash guard set and never needed to use it.
Again, on the Goldwing, I found the strongest part of the frame (passenger footrest mounting points) and ran square tubing back, bending it slightly where needed. Not very much bending was needed. Then I anchored it to the point where the rear fender attaches to the frame.
It shouldn't be any different on other big bikes. Here are a couple examples of "home brewed" hitches.