for a regular "stratpoint" ("territory_point_mp" for the game), the resource income is changed by 1 fuel and 2 ammo.
for a fuel point, the resource income is changed by 2 fuel.
for a ammo point, the resource income is changed by 4 ammo.
This sounds correct. I think this counts for each sector that you own, with a max of +6 ammo and +3 fuel. So if you own at least 3 sectors, all of your trucks will be hauling in at their maximum potential.
Did anybody try 2 trucks on one point? lulz