Like stated above the 75 is not the height, here is a good quote
"Aspect Ratio is the ratio of the height of the tire's cross-section to its width. The two-digit number after the slash mark in a tire size is the aspect ratio. For example, in a size P215/65 R15 tire, the 65 means that the height is equal to 65% of the tire's width. The bigger the aspect ratio, the bigger the tire's sidewall will be."
To answer the original question 285's can mount too the rim. In some cases, like for my truck, the 285's where rubbing on the upper control arm but thats with my lift that changes the angle of the UCA. In a stock truck the angle should clear the tire.
Now the tires should ride on the street without rubbing but if when you start to turn depending on the tire tread they will rub the plastic valance on the bumper which like in my trucks case even with 4.5" front lift needed to be trimmed.
Now when offroading is where your going to have issues. Without any lift if you start to flex out you are going too rub pretty bad. Even with my 5" rear lift and 4.5" front lift the rear tires will rub the inside of the bumper, its not that bad but without any lift it will be horrible. Also the front i'm sure will also rub at any flex.
So it comes down too, if its for the street only and you can do some cutting they will work.
