Planning to tow 7500 pounds with Ram 6.4...ok??

We just completed a cross country trip pulling a 12,000 pound Big Country with our 2015 Ram 2500, 6.4 and 4 x 4. The 6.4 is an absolute beast. We had no problem crossing mountains, and the average mpg for the trip was 7.5. Not the power of a diesel, but enough power for us. This is a big, beautiful country and I urge everyone to see as much of it as possible. It is even more enjoyable in an RV.