Wouldn't it be the same? I mean if the rear of the car is lower due to weight, it would still be lower going up hill, right? (he says, holding his hand in funny positions). I would guess maybe it doesn't react that fast, thereby making it useless for hills?
Re: Getting "flashed" with headlights while drivin I called that bodyshop again. The tech claims that autolevel for HID has the basic assumption the headlight aim is correct to begin with. If the headlight aim is off in any way, the autolevel could actually compound the error. I can imagine just how blinded an oncoming driver would be if HID was aimed too high.