So the gentleman, that attempted to help me today, has a huge customer service problem. He also basically told me i was lying. I wanted to install non standard size tires on my truck. Smaller circumference for a better rpm while towing my boat and trailer at highway speeds. There are many many online calculators for this. My selection would have raised my rpm about 500 at 55 mph.. PURRFECT.. However, the "salesman" had far more knowledge than MATH,and facts, and told me it would be a huge dramatic change. My undercarriage would have issues. The sidewalls were not big enough, blah blah blah.. . etc.. . . uhm.. yeah man.. thats exactly what the customer WANTED. The customer was not naive, was well informed, and knew exactly what he wanted.. Shorter sidewalls and a smaller circumference.. Yeah you dont want short sidewalls in a truck that goes off roading.. My truck tows trailers on highways, and good roads.. Hardly ever even see's any dirt on the road ,short of my driveway. I got them installed, mounted, balanced, and free rotation for life, for MUCH less somewhere else. HE simply didnt need the business..Too bad, as a local business owner, I wanted to support them. I included a snapshot, for the "salesmans" personal information.. In the future, an open mind might get you into my open checkbook.. But I doubt it! Please note the speed difference at 60 mph.. Pretty damn drastic change.. stunning... Problem is,, people who think they know everything. At most the chassis would be .75 inches lower, lowest point being the rear axle pumpkin. If lowering my big high truck, .75 inches, and changing the final drive ratio by -4.6 is considered DRASTIC, ill eat my dirty socks.. It's in the math.. I dont care if YOU have been doing it for 30 years.. FACTS outweigh your"feelings". Time to buck up, and learn new things..