The stay in 6th gear setting gives you the most control. If the Jake is not holding you at a safe speed on a hill simply apply brakes to drop the RPM to about 1400 and down shift to 5th. On my 45' Signature the Jake will hold me in 6th on most hills that I run into in the mountain west. Your lighter 36 coach with a 400 should do about the same. The Jake brake is far superior to exhaust brakes that many coaches have.