Rohloff is great for a big tourer like the Raven. Very difficult to damage, even if you drop it. Doesn't need adjustment in the way that a derailleur does. Ideal when you need reliability.
The great advantage, especially if you are fully loaded, is that if you stop in the wrong gear, you simply wind it round to the right gear and off you go.
Unless you are super strong and super powerful, the hub is more than capable of taking the strain - nothing to worry about.
SJS offer two front cogs, so if you want to lower the gearing, just swap the cog. i do it regularly depending if it is easy riding, or touring with a heavy load.
Downsides? Need to change the oil once a year - takes 15 minutes and dead easy. It sounds a bit noisy in gear seven, but above that it is almost silent and below seven, nothing more than a mild whirr! Weight is perhaps a bit more that a derailleur, but in the great scheme of things, hardly noticeable.
Would I go back to derailleur? Not on a big tourer ( I have a Mercury), but I enjoy the derailleur on the road bike.
For the Raven it is the ideal set up!