James,
By your list of the work performed, it would seem that you have outlined what those in our small community of owners either knew or have learned. Maintenance is important. All of the coaches in our group are 35~40 years old, and they have all had the work you have described except the steering dampers were stock. Getting the front end dialed in will make an amazing difference. I know.
Brake fluid and hoses are often ignored at great peril. It is pretty much the same with all the other rubber parts. And while you are changing out the radiator hoses, it is a good idea to replace and coolant and maybe even flush the cooling system. The glycol does not wear out or age, but the corrosion inhibitors sure do.
Matt
