I pull with gas trucks for personal reasons. I like diesels but don't want to deal with the potential issues that one can have. If your not happy with your current setup with power, you may want to consider the deisel option like others have said with a long box. I missed what you were towing but if I had a large heavy slide in unit then long box all the way. If you choose to stay with gas, order one with the 4:10, or 4:30 option and both GM and Ford gas jobs respond well to a custom tune. Did this on my gas 6.0 and I'm happy with it. I mean your not going to have deisel power from it, but drivability improves and the truck becomes much more responsive with the tranny being much more responsive in the GM trucks. I don't know if Anybody has a custom tune for the Hemi, but I'm sure others will chime in. Regardless, dually will provide stability for a slide in and either gas version should make you happy with better gearing.
