With the alternator and a couple of batteries you would be fine running the 2000s at 2 ohm strapped or 1.4 strapped but yes you would void your warranty at 1.4 strapped or .7 ohm each but I have seen a 1500 at .5 ohm daily with stock alternator and 1 extra battery do just fine.you could try 2 3500s but you would need a lot of electrical upgrades to feed them daily.