Preventative Maintenance for ISX w/ 500k

[Poundtowne]

I just bought a 2016 KW 680 with 559k miles on it and I plan on leasing it out. It has an ISX in it that has all the original aftertreatment devices on it. I am prepping it now so I can incur the least amount of maintenance bills as I will be putting it under a $ per mile maintenance agreement where I cover all the costs as long as repairs are done at my facility or approved by me when on the road. My question is: what should I do to this truck now to minimize my potential costs later?

• I know you have a procedure for minimizing aftertreatment costs. I believe it entails cleaning the EGR system and thoroughly and replacing the IMAP, EGR differential pressure sensor, and exhaust backpressure sensor. Did I miss anything?
• I've heard that the viscous vibration dampener should be changed at around 500k miles is this correct?
• How do you feel about replacing rods and mains as a preventative measure?
• We have already replaced the fuel pump tappets and I'm going to run an overhead, drop and bake the DPF and DOC, and perform the normal PM stuff (ie oil change, diffs, transmission service, air filter, air dryer, etc..). Anything else that you recommend?