I think the rebuild and resupply times for HQ should change.
As it is now, it takes 2 guys in M3s (on some maps) 9 minutes to bring back up a hq without the train having made a single trip of resupply and about 11 minutes (one train load makes it in) on the maps without a nearby vehicle "EZspawn".
As far as resupplying other things, I feel that killing every single resupply convoy train or truck should raise the resupply times above the default.
As it is now, player resupply seems to have the same effect as trains and trucks carrying 1000 times more weight.