I have the Mod Series as well. You will have no problem with this rack bottoming out. You will be suprised how far it is off the ground. I use my rack on a Montana minivan and a Chrysler Cirrus. I can promise that you will hit your receiver hitch on the ground before you will ever hit the rack on anything.
I even have a hitch extender on the minivan which sticks the rack out farther than most. I had to get it because my receiver is not flush with the bumper. It is also what you use for cars with a spare tire.
In short, you won't find a place where you can bottom out the Mod Series. It is very high off the ground, almost too high in my opinion.