Finally!
I am happy to announce that entirely new features will be present in the next update of the mod.
"Infantry supply teams" and "Supply bunkers":

Infantry supply team
- small, 2 men squad carrying small amount of supply capable of resupplying units on the front line without being as big of a target as trucks or jeeps
- they themselves will be able to be resupplied through jeeps, trucks or suppy bunkers in the backlines and sent back to the front


Supply bunkers
- doing the job of an FOB
- there will be two types > "Ammo bunkers" and "Ammo depots"
> Ammo bunkers - having smaller amount of supply they are intended to be deployed near the front lines, defensive bunkers and trenches to resupply the troops on the front lines
- capable to be resupplied by supply vehicles
> Ammo depots - intended to be deployed in the back they provide large amount of supplies
- capable to resupply all other supply vehicles as well as units directly

Also the resupply chain will be implemented in cascading order, thus:
Ammo depots > Trucks, Armoured supply > Jeeps > Ammo bunkers > Inf Supply team


Sadly due to the limits of modding where we are not able to implement entirely new units for this we will have to use existing ones.
Bunkers will be easy as there is a lot of them unused in campaign, so bunkers of new zeland, us, brittish and others will be reused.
Regarding Infantry supply squads most likely candidate will be artillery observer units (beobachter and such) > to suplement those units i might implement radio to the dedicated recon units

Also due to the limitations of the game those Infantry supply units won't have weapons to defend themselves (although models will carry guns; same with the models of bunkers, they will have a machine gun in the front) > i don't know if i will have the time to make new models for the next update :)