The Dodge Ram with the cummins is very reliable. A 1991 is the old body style though which is prone to rattles. I have a 93 with 215,000 miles and a 1998 with 175,000 miles. Both are reliable, have plenty of power and get good mileage for a full size 4x4. I love the cummins engine and plan on putting 300,000 on both these vehicles. I highly recommend the Dodge.