If i had to chose i need the towing power.
why not get the minivan for practical use (if you had one) and then a truck for towing?
When the new cummins engines go in the durango and aspen they'll be towing machines too. It may surprise you to find out that the best configuration for the aspen nets you a tow rating that's 400 lbs more than the best configuration for the 1500.