Over 15% degree hills, you will not be happy with a front hub motor. I've had them and a 350w motor can barely pull me (at 130 lbs) up 10 degree hills with me pedaling hard. Before you buy a kit, I highly recommend going out to "test ride" some ebikes with both hub motors and mid drive. For your application, I would only consider a mid-drive. You will burn up your hub motor. Don't waste your money on a hub or all-in-one; if you're serious about a motor, save up for a mid-drive kit or mid-drive ebike.