OTOH, if you're trying to create an outpost near the enemy lines, maybe it makes more sense to have a soldier carry the minigun you want to use at that outpost through the jungle, rather than risk using a vehicle to deliver it.

A soldier lumbering through a jungle with a big weapon is a target, but a helicopter making a delivery, or a truck making a delivery is going to be a much bigger and more visible target with fewer things to hide behind.