I currently own a 1998 Chevy 3/4 ton pick-up, single rear drive, 7.4L gas engine. I am occasionly towing (3-4 times a year) 2006 Challenger 32TKB fifth wheel. I am pleased with the power the 454 gives me towing. I have also installed adjustable air springs on the rear axle give the truck a little more support in the rear. I will be in the market for a new truck next year. What would be better, buying a 1 ton truck or 3/4 truck and adding the air springs? How is the power of the stock ford V-10 vs the diesel for towing and everyday driving. Is the extra $ 5,000 worth it for the diesel. I know the diesel will get better mileage, but the difference in the price of diesel and gas in the part of the country I live averages 10-15 cents a gallon, diesel being more expensive. What about dual rear drive trucks, is this really needed for occasional towing?