I own a 2008 Chevy 2500 with 6 liter gas engine and 3:73 axle I believe. Truck is rated for 9500 lbs. Anyway I'm considering a larger fifth wheel RV and will need upgraded tow vehicle. I'm considering 2016 Chevy 3500 diesel but hear many stories of repair costs of the diesel engine mainly becouse of pollution and other add ons for the environment. Trying to decide if diesel is worth added expense. Fifth wheel I'm considering will be around 14,000 lb to 15,000 lb. I believe the GAVWR is 14,000 lb. Axle 12,000 lb and hitch 2590 lb. I realize this is a Chevy forum but Ford claims to tow 15,000 lbs with gas. Waiting to see if Chevy improves towing with gas or if it will work with 6 liter 4:10 axle. Does anyone tow heavy fifth wheel with Chevy gas power or anyone have opinions of maintenance and repairs of the 2015 or newer diesel? Trying to understand both engines becouse this is a lot of money.