My '05 Tundra (4X4) has 110K on her and I'd like to coax an additional 110K or more out of her. I just purchased a set of Bilstein 5100 shocks but have not installed them yet. Is there any reason to replace the coilover springs while I'm at it? If so, will OEM coils do the trick or should I purchase an aftermarket coil? I only get on the dirt a couple times a year. My main interest is to get as smooth a ride as possible on some of the most pothole riddled streets in America. I'm not averse to spending the money if there's a better quality coil available for my needs.