Thanks GForce,
Indeed facing the same problems,
Appart from making nice shot of Berlin see above link, was quite annoying ... and not practicle on map like Omaha where I destroy camping tanks on the beach.
(The shell would block the access ramp

)
I generally use -1 or -2 for vehicles driving IN the base to get proper destruction.
For stolen v?hicules (by parachuting campers) I boost the speed to - 45 to get instant destruction so the shell stays on the spot and is removed by the respawning vehicles.
A good alternative was to desarm the vehicle (negative supply of ammo) but the counter would not stop a zero ... run negative -25000 and ultimatly create a connection problem
Ive tried to work with the other parameters of the supply instruction (to limit the resupply value) , but in vain
