dodge 2500 cummins

[B-Faithful]

I am going to look at a 2003 Dodge 2500 4x4 crew cab with the 5.9 cummins and 3.73 rear. I currently drive a 2006 1500 silverado with the 5.3l gas but I am wanting a little more truck with the boat I own considering the distances I tow (NJ to VA). I need to tow around 7000lbs total and really would like to get into a 3/4 ton. The power of the gas 5.3 is fine for me considering the area I tow is relatively flat but the brakes and suspension are on the light side for what I do. ( I actually like my 5.3 better than my fathers 6.0 chevy gas)

The truck i am looking at is fully stock, has less than 70k on it, has had only one owner, dealer serviced, and said to be in great shape. It has the 4 speed auto and 3.73 rear. truck will be my daily driver too. I drive ~25k a year total.


Few questions:

1. Any concerns with the truck to be aware of?
2. What mileage towing and not towing?
3. Any expensive service items I need to be aware of?
4. I plan on keeping the truck fully stock..

Thanks for your help!