I have 92,000 miles on my coach ( I bought it with 75,000 on her) and sometimes feel she is porpoiseing more than she should! The shocks are Bilsteins and was wondering if that's what Beaver was installing in 2000? Anyway to determine their age, like a date stamp? My front tires are coming up on 6 years old and was thinking I might replace tires and shocks at the same time!