And you can use the AI to help you drive the Hemtt's over to the FOB.
However the AI are stupid... and they have major issues with bridges... but if you can avoid those, and force them to follow in a column... you can usually get them there no worries.
Does take a while... and you may need some protection, as roaming Nix's and rocket armed technicals are now on the prowl. (This is usually why I like doing logistics to the FOB)
For those that want to know:
Here's what each of the Hemtts do for the FOB. (Note: Vehicle = All Vehicles including Helos)
1. Medical Hemtt - Increases player respawn tickets at FOB - (and maybe a medical tent in the future? ? )
2. Ammo Hemtt - Spawns Arsenal Box in the command building and Vehicle Ammo at the Helo Landing Pad and Repair Bay
3. Fuel Hemtt - Fuel at Helo Landing Pad and Repair Bay
4. Repair Container Hemtt - Allows repairing at Helo Landing Pad and Repair Bay
(NOTE: the Supply Container Hemtt also looks the same as this, make sure you get the right one)
4.A. Vehicle Repair Hemtt / Bobcat -
VR Hemtt It's parked next to the artillery vehicle near spawn, and can also be used to tow the containers (e.g. medical pod, ammo crate, etc)
that are next to it. Bobcat is also classed as a repair vehicle and can activate repair services. Both can tow other hemtts.(Only a player can tow, AI can't)
5. Supply Container Hemtt - Spawns transport vehicles at the FOB.
Hope this might help some ?
Edit: Please correct me if I have this wrong guys.