I have the owners manual , its general data and maintenance for all if applicable. Its for all model of Sonnybrook 2004 -2005 smallest to 5th wheel. The only spec i have is listed in the drawer label.
I found what i wanted to know at this web site,, it shows 50gal for all... http://www.rvroundtable.com/wp-content/uploads/Sunny-Brook/2005/2005.SolantaBrochure.pdf