The only Monroe shock that worked well for me was the Reflex. If you can get Reflex for a Durango they might do a good job for you. I say the Ultra is a much better shock than the Sensa Trac and I have used both so I have a good idea of how they perform. Go on the Pep Boys website they usually have a $20.00 off $100.00 coupon. Print it out and Autozone will probably honor it. It's not 30% off but is better than no discount at all. Or you can get a set of Ultras from Amazon or other online store like Steve did.
2001 Dodge Dakota, 3.9 V6, 5-speed manual, 185K
Valvoline 10W30, Proselect 21085