Shimano Nexus 3-speed for hills

In March this year (2024), I’ll be making a journey to visit friends further to the west, beyond bicycle distance. They are cyclists, so I’ll be keen to take along a bike for local use, and that poses a thread-the-needle problem for my current stable of four steeds. The Dahon K3 is a tiny folding bike that can be taken on the train with no problem, but it’s not meant to carry loads, and it’s not geared for hills.