Update...I ended up going with the 275/60/20 tires. I am fortunate that i buy alot of big truck tires and so my tires shop originally put on the 275/65/20's and they rubbed with the readylift 2.25" kit. I did not want to modify wheel wells or fenders and if it rubs now, any kind of off road situation will rub worse. So we took off the 65's and went with the 60's. No rub. I am very happy with the looks and the outcome. I choose not to do any different blocks in the back until i hook up my new trailer and see how much it sags this max tow pacakge. If it lowers the rear too much i think that i will go the firestone air bag route.