After putting 12K on my used Goodyear 30x9.50 tires, they were starting to look pretty bad. I figured with winter comming fast and not much time inport, I would go ahead and install Duece's old 31x10.50s. I installed the add a leaf this afternoon and go two of the tires mounted up. Right now it looks like a hot rod with the lift in the back and the bigger tires. I am going to tackle the front end in the morning with coil spacers and then mount up the rest of the tires. I am a little concerned with the rear pinion angle, but I will see if I get any vibs at high way speed. I had it up to about 40 mph as it sits and I didn't feel any problems.