I would. Pretty sure thats the design of the tub otherwise they would have sealed it completly from the factory I would think. Quick search of RV/travel trailer tubs you can kinda see the lip behing the wall.
https://images-na.ssl-images-amazon....L._SL1000_.jpg
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16' Amerilite 248BH Friendship
15' Chevy Silverado LT/88' K5 Blazer
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