Hi Steve:
One thing I would suggest you get is an extension to your front fender mudguard to prevent stones and rock chips from being tossed up into your radiator. These extensions are available pre-made from a number of sources, or, you could just get a thick inner tube from an old truck or bus tire and cut your own.
I ride my ST1100 on gravel roads without even thinking twice, it is probably as heavy as your Gold Wing (350 kg wet, without me) and almost certainly more top-heavy. Just pay close attention to gravel berms that tend to build up whenever the road curves.
You will probably find that your stock exhaust system has drain holes at the lowest point of the mufflers to let water out, so no worries there. A much more serious worry would be getting water in the crankcase. Find out where the breather hole(s) are for the crankcase, and don't ever let them submerge. If you want to rig up some kind of extension tube to raise the breather hole, be sure to do it out of metal tubing, not plastic tubing, which can deform and kink under air or water pressure, and thus defeat the purpose of the breather hole.
Below is a photo of what I mean by a mudguard extension.
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