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The tank size is a programmable parameter in the IPC (instrument panel cluster). They can hook the IDS to the truck and reset it. It takes longer to hook the IDS up than the time to change the parameter.
My local dealer said it couldn't be done. I found a dealer in Louisville that had it done it no time. Made me rethink who is working on my truck locally. It did cost but it seems to work fine.
Titan and TransferFlow sell 65 gallon tanks for the 2011-2016 LWB trucks. They also sell a 50 gallon tank for the SWB trucks. The initial price is a bit costly but worth it over the long haul.