I run a remote field station in central Africa, and we are purchasing a quad (probably a Yahama Grizzly) to ease access. Given parts and funding are hard to get hold of, I would like to take full advantage of their current availability and get a set of spare parts that will probably be required in the next few years.
Typically weekly usage will be 100km along an old forestry road (dirt track) with some pretty rough patches. It will probably be pulling a trailer.
We will have a maintenance protocol (e.g. washing, drying, spraying with WD40, oil checks and changes) but if there are any other suggestions from people familiar with quads, they would be more than welcome.