We have 2013 Redwood 38RE and have had issues with the black tank leaking waste in the under belly of trailer.. After 3 Different RV Repair Services paid for and no fix to the problem we are going to replace the tank and be done with it !!! Any one else have this issue.
The tank gets a kink in the side above the drain to drain pipe I heated it with a heat gun and it all lined back up then I put a extra brace above the drain to stop it from doing it again
The initial problem was that it wasn't braced up to the trailer so when traveled the tank would move about and come apart from the toilet connection... Fixed that by mounting it securely to frame..still issues so again underbelly off and changed seals etc.....