[WallShadow]

All these ideas about limiting PC's equipment struck a chord with my evil side--

Let the players have their full allotment of equipment, ammo, and/or gold.
Have them have it loaded it up on their vehicles by some grunts, encouraging the players to spread your team's well-marked belongings among several vehicles to prevent one person's stuff getting completely wiped out if the carrying vehicle is destroyed. "Gee, sir, this truck was bottoming out. We moved half of the cased ammo out to the HQ HumVees." Or--"Those TOWs just won't fit there, sir. They'll have to go on Sparks' trailer." and similar displacements of items without the owner's prior knowledge. "Sorry, sir. You said we hadda have it all loaded and that was the only way we could figger it would fit!"
Just then the Russkies come knocking.
In the "sauve qui peut" of the rear areas' overrun, one or more of your vehicles gets taken by mistake by fleeing members of your unit.
While they don't actually have all their stuff, they know which way it was last seen heading. A hunt, a quest, to recover their rightful property!