Of course there is also the possibility that the tank size was changed. This is from their brochure:
"Forest River, Inc. reserves the right to make changes in prices, colors, materials, equipment and specifications at anytime, without notice, and assumes no responsibility for any error in this literature."
Goody Two Shoes and the Filthy Beast
2008 Chevy Silverado 2500HD
Duramax and Allison 6 speed
2012 Wildcat 282RKX
You can't make things idiot proof, you can only make them idiot resistant.