Fresh water tank size

[Butchkoral]

I have a 2005 Sonnybrook Solanta 2406. Book shows fresh water tank is 50gal. It seamed to fill to fast for 50gal. Anyone know the capacity of this camper?

 

[TonyMac]

Capacities are maximum cubic inches of tank size, 231 cubic inches per gallon. Usable is that size, less head space and unusable capacity below the pickup. Oyteher than that, I got nothing. Can you measure the tank L W H?