2009 LTZ - Z85 with 20" factory wheels, Goodyear Eagle tires. Just got this truck and the ride is a little firmer than I would prefer. It drives and looks great but you also feel the road. Never had 20" tires before so do I just 'get used to it", switch out for 17 or 18" wheels/tires, or try a different shock. The only real towing I do is an 18' boat during the summer months. Thanks for any suggestions.