Well the other 2 slides D gasket along with the first replacement put on have failed.
The rubber manufacture, BOYD, came back with a vary length list of products NOT to use.
The only recommended items were LYSOL (any flavor) 409 and dish soap.
Well Thanks to one Jeffery Holmes at Cedar Creek customer service who pursued this issue for over 3 months, we now have all new seals installed.
We have been told there was a change in the formula used in manufacturing.
We leave for are winter quarters next week, here is hoping I have seen the last of this problem.
2013 Silverado LT 2500HD 4X4 crew Cab Duramax Diesel/Alison
2016 Montana 3721