We have a 2012 Ram 1500 4X4 w/5.7L hemi, 6sp auto, 3.55 gears and Michelen LTX AT2 tires and tonneau cove. We pull a 2013 FR Surveyor SP220 Sport that weighs 5000lbs loaded. In the quest for more power and mileage I did the following mods to my Ram; Vararam intake, Magnaflow 14" muffler and Bullydog Gt for Hemi tuner. I think I am close to 410-415 horsepower now and have plenty of power. The muffler isn't loud at all except under a real uphill and mileage solo now is 17 around town and 22-23 on the highway. Towing mileage, on the flats, went from 10 to 13 and I have gotten as high as 15 with a tailwind. I have about $800 in mods but feel they were well worth it.
2013 Forest River Surveyor SP220 Sport
2012 Ram 1500 4X4, 5.7L Hemi quad cab