Pulling a trailer with a 2014 Ram question

I have a 2010 Laramie with 3:55 gears and a 6 speed.I use the Tow mode which only uses 5 gears, I run between 60-70 mph with a 4700 lb dry 22' trailer. The 5.7 has no problems pulling it and I average 10-12 mpg average. I have however modded mine slightly, 89mm smooth bore throttle body, Varramm cold air kit, less restrictive muffler, 1000 lb air bags, Reese dual cam, hard tono cover. I usually have a 3300 watt gen, 10 lb propane tank, chopping block,5 galons gas, glider chairs in back of truck, 2 adults andone 5 lb dog. I am at limit for payload but not over tow capacity.