Tout Terrain build really marvellous touring bicycles, they make touring less cumbersome with light sturdy frames equipped with built-in pannier racks.
Good gear ratios are vital when touring, especially with luggage, it is particularly important that lower gears are available to master long climbs.
While with internal gear boxes, whether Pinion or Rohloff, there is nothing you can change in regards to the primary internal gear ratios and that's different with a derailleur drivetrain system - and it is its biggest advantage.