What about something small and handy like a gyro chopper.
Theres one in FarCry 5 that would suit the game really well, something like that is what I mean, not to overpowered or anything, just an explorer craft , unlockable really late in the tech tree.
Give it a cargo box as big, as many slots as the trucks and make it useful late game.
Make it the second or third tier weapon after the rifle.
Give it a winch for light lifts of cargo, maybe give it the ability to lift one small cargo container or to be upgraded so it can lift a tractor out of a valley or the like.