I am purchasing some OE 20" Chrome Clad wheels for my Challenger RT, to replace the stock 18" that came on it. I will need the TPMS installed, new tires mounted and balanced and installed. I plan to buy the tires from my local DT. What are you recommendations in 245/45/20? Can you give me an idea of installation costs? (Except for tire purchase price) Do I qualify for any discounts?