What I heard from my South African friends who experienced the 1960s there, was a Land Rover Series I or II could be disassembled by hand, with hand tools, and nearly completely rebuilt not to speak of repaired in the bush. And it was claimed yes, they could be portaged across any terrain once fully-disassembled with sufficient manpower, beast power, time, and logistical train.
Portaging was not done lightly, as the effort was considerable, and the vast logistical tail to accomplish it had to hoof it back on their own with the exception of the handful or fewer who could ride onwards on the re-assembled and fueled up Land Rover. Carrying the fuel and bare minimum consumables for the round-trip logistical train (assuming foraging on the go was even an option) I imagine was almost as much of a burden as the vehicle itself.
Toyota does seem to have taken over this niche though, as Land Rover doesn't seem too interested any longer in the market these days.
Portaging was not done lightly, as the effort was considerable, and the vast logistical tail to accomplish it had to hoof it back on their own with the exception of the handful or fewer who could ride onwards on the re-assembled and fueled up Land Rover. Carrying the fuel and bare minimum consumables for the round-trip logistical train (assuming foraging on the go was even an option) I imagine was almost as much of a burden as the vehicle itself.
Toyota does seem to have taken over this niche though, as Land Rover doesn't seem too interested any longer in the market these days.