There is a difference between a heart attack and CAD... I think you should get a 2nd opinion. I was told more or less the same thing after the stress test .. come back in a week and we will check to see if you need stents (cardiac angiography) to see...
Make sure you get the Trailer Tow Package - High Capacity, otherwise look at the 350's. There is not much payload left on a 250 after you fill the tank and add 3 or 4 people.