16: Ram 1500
The Ram is a good truck with a good personality and the sales have been strong. But you can’t deny that there are many reliability issues with the Ram. First and foremost is the transmission, which is well known for failing. The Magnum V6 engines also suffer from many fuel injection issues as well as timing chain issues (via Readers Digest).

It’s the little quirks on these trucks that make the maintenance so expensive. When the truck gets higher into the mileage, you will start having issues with overheating and more. The trucks are comfortable and stylish, but the reliability is iffy at best.