Give a man a fish...he eats for a day..teach a man to fish..he eats for life.
You can actually go all the way up to '4' with an object spawner. 1 being axis, 2 being allies -- but teams 3 and 4 work as well. For instance:
ObjectTemplate.create ObjectSpawner LightTankSpawner
ObjectTemplate.setObjectTemplate 1 Panzer
ObjectTemplate.setObjectTemplate 2 Sherman
ObjectTemplate.setObjectTemplate 3 SBD
ObjectTemplate.setObjectTemplate 4 Mustang
like urglub showed, just be sure when you add the position of the vehicle in objectspawns.con, you add Object.setteam and use the number of the vehicle you want. Even though its a lighttankspawner, it will spawn a mustang (in this case) if you do a setTeam 4.