I have a stock 87 F250 and plan on taking it out to the dunes this year. My street tires are 285/75/16s. I know I can fit a bigger tire on the truck than the 33s, but was wondering how big. My uncle has a set of 17/40/16.5 gumbo mufflers lying around his property and I was wondering if those would fit under my truck. Please don't tell me to cut the fenders to fit them as I don't want my truck to look like a piece of ****.