Sounds like the drain lines can be a particular problem in many coaches where the drain is located on a slideout. I think the lower slide sweep is important to retain for keeping out dust, water and most small critters. Your coach is not very old so the sweep should still be in good condition if installed correctly. Do you have enough room/slack to lift and support the hoses etc up off the floor away from the sweep action taking place? Sometimes just getting access to make changes is the worst part. Attaching some other folks/coaches having leaks caused from flexing drain hoses in kitchen slides. Someone suggested using flexible pool hose as an alternative flex drain hose. Good luck. Hope my link works.
Kitchen sink flexible drain hose replacement - iRV2 Forums
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