The only obstacles you gotta avoid are those blocks of snow/ice that fall off the bottom of cars, they usually make some disturbing noises when you drive over them.
I know thats what im afraid of You cant avoid them all.
+ I hate that scrapping noise when I pass over something and my car's not even dropped yet!
What does it hit under the car the table, arms? Is the oil pan higher up?
Im unsure about the mk4 i havent really paid attention.