owners manual

Several sources for the bike part as I'm sure you know.
For the trike part, it depends on what brand conversion you have????
There are just 3 or 4 brands that allow a do-it-yourself install and those manuals are on those manufacturers web sights.
About all you get w/the others are a few pages that tell you basic service intervals and some info for wear parts. Those are available from the manufacturers of each brand.

I have a Motor trike kit on it installed by AJ cycle. Just hopping to find one for the bike. I found a few but hate to pay $60 for one.

Bike manuals

Here electronic docs. No trike info but general bike stuff. For most year goldwings.

http://goldwingdocs.com/Manuals.asp?type=GL1800

No owners manual for a trike as they are not made by Honda and the trike kits never seem to come with any kind of manual .