I have a 2011 Tahoe with the 5.3L engine/towing package. I was wondering if I might have any issues with towing the larger size boats, such as a Tige 24V. I am concerned mostly about my first tow which would be bringing back the boat from the South East, over the hill and dale up I81. I am mainly worried about climbing/descending all of those hills on the way back. I have never towed anything before. Once the boat is resident here, most of the tows are on flat land within 20-30 miles. I am assuming my mileage towing is in the 9-11 mpg range.