You don't even to all-in the scout car just use them to ward sniper off. Even upgunned they still do ok vs. snipers. If there is units in the way, use combined arms or simply engage the enemy elsewhere.
Between mortars and scout car you should be able to keep the sniper pretty ineffective till you can get some armor out, ostwinds then eat them up good
All you got to do is get them to keep retreating, you don't have to out right kill them although if you can that is a plus.