Had our first trip with the RDS 63 gallon aux tank installed. Best thing I have done for the truck. Fueled up in vegas for $3.49 and went to SoCal for a week. Cruised right by the interstate truck stops with diesel at $4.59. Put a few extra gallons in while we were camping at Port Hueneme Naval Base. Never had to worry about where I would fill up or wasting time standing in line at truck stops to pay for fuel. It's an awesome convenience and may save me a few dollars in the long run.
Rob, that's a nice truck - the Duramax and Allison should be a sweet combo.