Hi !
Welcome to IRV2! We're sure glad you joined the gang!
I would start by contacting the manufacturer's tech support group. Hopefully they can tell you where to get the new tank, and possibly some info on installing it.
Good luck, happy trails, and God bless!
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Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD