Well thought out. Are you going to add anything else to increase the capability of them. Example, more armor improved menouverability (not sure on the spelling), harder to hit the crew.
One of the problems I find with cars with weapons, is whenever you do an SAS vehicle style attack on a enemy base you get very quickly, the enemy just lie down a shoot you. The gunners are also a problem, you'd want them to spray MG fire all over the enemy, but they hardly fire a few rounds before they get killed.
Also the drivers of the jeeps always slow down whenever they come to an enemy, "eh, excuse me have you seen any soldiers dressed in Soviet military attire carrying AK74s?"