I have a piece of conveyer belt rubber that I use as an extended mudflap from the inside of the mudguard to just below my towbar to stop the crap being thrown up from the rear tyre from getting into the towing joint. I put bolts through the two holes to secure the rubber to the mudguard.
Another vote for an auxiliary brake/taillight mounted to the rear fender boss. I used an Admore Lighting 8" light bar and the mounting hardware that came with the light fit perfectly in the RT fender holes. I kept the light from a previous F800 GS where I drilled mounting holes in the rear fender. On the RT, I can remove the light and there will be no evidence it was mounted.
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