[longdistancerider]

No help with this one but I remember that bike. There's been a couple of side car rigs posted over the last few years, fairly rare. All of them have been the A model

 

[longdistancerider]

That's some good information, thanks for posting this

 

[longdistancerider]

It looks like the rear mount is going up to the middle of the curved tubing section of the frame, right behind the left side cover. Hard to see if there's also another pickup point from the left passenger peg mount, not sure I'd trust the cast aluminum for that loading.

 

[longdistancerider]

I've toyed with the idea of a sidecar, have to get a special license here in Washington state for that.
Mechanically there shouldn't be any problem with using the swingarm bolt location for a mount since it's one of the more rigid points on the frame, much longer bolt needed and the mounting point would need to have a bushing to space the mount out a bit for clearance. As for the viability of the rear mount being so close to the front mount I have no idea.

 

[longdistancerider]

The way that bolt is set up is that the dust covers for the swing arm bushings actually tighten up against the end of the bushing leaving the swing arm free to move. What would be needed is a thin bushing on the outside of the dust cover to space the bracket away from the cover to ensure free swing arm travel. If the cover gets pushed in against the swing arm it'll bind and restrict suspension movement.

 

[longdistancerider]

Interestingly enough a sidecar just popped up on the local Craiglist for $995. Goldwing brackets for it. I'm almost tempted to get it just for grins and giggles