Rather than take a heavy Chain wip and spanner on tour for that once in 5-8000km that you actually reverse the Rohloff cog, I either borrow stuff from other cyclists or use my old chain (which also usually needs replacing around 5000km) to make my own chain wip and borrow a spanner from a local garage. Saving dragging heavy tools around :). The only tool I need to take with me for the Rohloff is the actualy Rohloff tool.
The extra leverage of a 2×4 makes it alot easier too 🙂
Tip: Don’t lie the wheel cog side down while the cog is removed or the oil will leak out.
I change my oil about every 10,000km. The advise Rohloff give about changing every 5000km is based on mountainbikers that like to clean their bikes with high pressure hoses every weekend……