Wow, thanks for the feedback guys. Since I am going to do the job anyway to install wet bolts, looks like the $80 upgrade to the EZ Flex is a no-brainer. Nice to hear about it really reducing road shock. I tow with a short bed and autoslide hitch, so I can't use an air ride pinbox or anything like that. The only gripe we have right now is that overpasses and expansion joints chuck fairly hard.
What has started this project is my left tires have started wearing on the outside. There aren't any suspension cracks or broken welds, so i'm thinking that the nylon bushings are worn out and allowing the wheels to get out of alignment. We have actually put quite a few miles on these tires and I will replace them next year, but I would like to correct the uneven wear.