10” is common among Montereys and Contessas of that era. There may be such specs in the Chassis section of your owners manual, but I’ve read that Monaco did not include ride height specifications in at least some Monaco Coach manuals after 2006; they may have neglected the same in their Beaver manuals. If you don’t have the manual, another owner here may check theirs for you. Also, Beaver Coach Service should be able to supply the proper number.
Joel