You don't need a DRW for that trailer, so if you prefer SRW (as do I), just go for it and don't look back. As far as which one, I looked at them and my favorite was the Ram with Cummins. It seemed to me to offer the best combination of solid chassis, nice ride/handling and hopefully a reliable engine. I read a lot of things that made me leery of the CP4 injection pump that the Duramax and Powerstroke both use, and the older style CP3 unit in the Cummmins seems to have fewer issues.
They are all more than capable of handling that trailer and they all have pros and cons to consider.