Need some feedback on this please. Getting new 2013 Silverado 2500HD with the 6.0L engine. I tow a 35' Travel Trailer weighs right at 6000lb loaded. Q: Which rear axle ratio does everyone recommend? The 3:73 or 4:10. Would prefer a balance on MPG and Tow Cap since this wont be a dedicated tow vehicle & serve other needs as well. Need to make a decision by Sunday for the order. We camp on a monthly basis and plan to visit some NC Mountain campsites. Any feedback ismuch appreciated. PS: Diesel is out of question, hate them. Can't justify bennies against increased fuel and maintenance costs, exhaust scrubber cost as well as the purchase price. Not in my budget.