While doing a search, I came across the owner's manual, which I'm attaching here if you don't have one. Unfortunately, it does not list the fresh water tank size.
Fleetwood Tioga Owner's ManualI also checked NADA guides which will list the specifications if they are available. No luck.
2016 Ford F350 Turbo Diesel SRW 4x4
2017 Grand Design Reflection 297RSTS
2013 Ford F350 Turbo Diesel SRW 4x4 (Destroyed by fire - 8/29/16)
2014 Grand Design Reflection 337RLS (Destroyed by fire - 8/29/16)
