Right bike for the right job. The RT is for touring, serious miles and comfort along the way. I have found my GS does that for me and when I want to go off road, it does that pretty well. I took off the huge "pope shield" fairing the PO had installed to get some air. It's a bit old and crude compared to the newer GS line but was relatively cheap and can haul a ton of gear with confidence.
The other BMW is for going to old bike gatherings, having a pint, talking about slingers and putting back home.
The Duc puts a smile on the face, sounds amazing, corners well, looks very good doing it.
The KTM is for more serious dirt riding with my friends who generally only ride on dirt.
They were all bought used but in good shape, less investment in total than a new BMW. Looks like you have a fun and sporty bike to replace the RT sell the boring bike and have fun riding.