Dear Friend,
I have a 2000 Silverado Z71 Ext Cab 5.3 L with Bridgestone Alenza 265/75/16 tires with Bilstein shocks that I purchased around 2005. The shocks still perform like new and this is my 3rd set of Bridgestone Alenzas. Compared to new Silverados off the lot, my truck rides smoother and handles far better. Shocks and tire can turn a stock truck into a fine Cowboy Cadillac for a nominal fee. Forget Michelin tires no matter what the sales people say. I've tried Michelin LTX and they didn't come close in performance to the Alenzas. For a new 2014/2015 or 2016, the best choice in tires would be No 1, the Pirelli Scorpion Verde All Season Plus 265/70/17 with new low rolling resistance technology and the new Bilstein shocks which have a new improved piston that offers a smoother ride. Compared to a new truck, you'll notice a dramatic improvement over the stock tires and shocks..and the shocks will last an honest 100,000 miles whereas Monroe or Rancho, while warranted for life, will start to deteriorate at 30,000 miles. Do yourself a favor and start out fresh with quality tires and shocks. Stick with the 17" wheels as the sidewall is higher and provides more air in the tires which translates into a smoother ride. You'll notice a dramatic improvement and will never have to replace the shocks again for at least another 100,000 miles. As a second best tire, the new Bridgestone Alenza Plus 265/70/17 is excellent and a third choice would be Continental Cross Contact LX 20 with EcoPlus 265/70/17 (rebate until Nov. 2 and best deal of the three) Best fuel efficiency would be with either the Pirelli or Continental. All three tires with these shocks will far outperform the stock equipment. If you buy new, take then off, sell them as new on any number of on-line sales websites and put on 1st class quality shocks and tires.
As a second best shock, the Rancho RSX or Monroe Reflex is a two stage shock that will ride smoother on dirt roads, but not as good as a Bilstein on paved roads. Enjoy your new smooth Cowboy Cadillac ride. In many respects you'll be surprised to find that your vehicle rides better than many Lexus, Lincoln and Cadillac models.
Jimbo