It certainly sounds like something is wrong with your suspension. Have you found out where this is coming from, the front setup, the back setup, under the front bonnet/hood or from the back boot? Have the car jacked up and probe around to see if something's come off their normal position, loose, broken off, damaged or what? An experienced tech should be able to find it quickly. Could it be something in the car thats running loose when the car is inclined? Maybe some of your suspension parts have had their day and something is in need of replacement. Just my 2cents worth!