Dear Mr. Hegermann,

as a rule of thumb inclination may reach max. 8° for "common" goods, however every degree of inclination increases the required power input significantly. But as you pls. see, this is a principle of transport very much depending on insight about the actual bulk material to be transported, essentially its behaviour under vibration. So in general i know of a common utilization only in horizontal mode & would advise you to contact a reputed supplier who will readily support you in questions of design decisions, power calculation etc & will take professional responsability in doing so.

Regards

R. ■