Since new my mounting plate on my pin box has about a 6° slant on it. Makes for a bit of a challenge to hitch up. I googled Trail Air and read about installation. Says it should be installed level. I've tried loosening the two bolts and still couldn't get it to budge. I mentioned it to the dealer when we took delivery (2 years ago) he said it wasn't adjustable. Any way, how's everyone else's?? Level or slanted down??