There are several posts on this and you can find specific details on various repairs there. I pulled the tank, added 2x6pt stringers under the plastic pan. Added some insulation and finally put a sheet of plywood under the tank. Added new overflow system to stop siphoning and added a bar to keep tank secure.
Others have added unistrut, steel bars or solid plywood under the plastic liner. Some people had jayco do the repair while others did the repair them selves. Someone in a earlier post had said they talked to a Jayco engineer who stated that the flex was okay and within their design criteria.
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Paul
2018 37TS
Jeep JL
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