There is obvious problems with vehicle reloading after depleting part of their ammunition storage or whole ammunition they take.

The biggest problem is with M5 Sandstorm, no matters if it deplets it's ammo only partially, or whole ammo is depleted, it won't reload driving close to a single or multiple ammo trucks.

Tanks problem is smaller, if ammo is depleted partially it will reload, at least partially, mostly only mg is not reloaded fully. However if ammunition is completely depleted, tanks might not reload at all.

This happens both in vanilla game and with addons/mods. Addons/mods are also affected.