Disibility schooter in San Francscio Hills

Does anyone know if a mobility schooter will manage on the hills of San Francisco?  I've never seen one in the hilly areas of the city, but my local dealer says they 'might' (he sounded unsure).  However, I don't want to spend money before I know if it will work!

Are there any schooters which are better in hilly areas?

The hills around my house are quite steep