Welcome to Allied subject building! If I may: 1) primer: US painted equipment had top coats baked on and notoriously tough. Modelers should not follow the Axis fad of paint chipping. A better thing to do is to weather it dusty and show areas of darker olive drab, where the crew has scuffed off the dust to reveal the base color.
2) loadout of .30cal ammo. Your scenario of a recon jeep in the ETO is sketchy. Frankly there were much better vehicles to perform this role. Plus a recon jeep wouldn't need a load of ammo -- recon vehicles aren't meant to engage in firefights. You see any enemy, you retreat. A huge load out of ammo just doesn't make sense. Remember, this isn't the Western Desert where long range recon vehicles were far from friendly lines. In the ETO, access to friendly supplies wasn't difficult.
But this is my opinion only.