I have a 2003 Silverado 2500 Diesel it has LT 265 75 R16. I talked to my tire guy about going up to 17 or 18 inch wheels because I had been hearing about tire choices in 16 inch wheels becoming less available. He said if I were going to change that it would be better to go with 18 inch because there were more available in that size than 17 inch. I am at the point of needing tires now but there are still plenty of 16 inch available so I don’t know if I will change or not.