I just got my new 2500, will be putting a new Western Wide Out plow on it in a week or so. There is a spot for a second battery,,,, do plowers' normally use the 2 battery setup ? I had a ford F250 , it also had a spot for 2nd battery, but I never put one in,,,, it works fine, but there is a light dimming when plow operates,,,, so what do you guys think,,, 2 batteries a must,,, ?? Truck has the Plow Package, so it has the big alternator,,,