Taking up 2 spots can be very risky. You WILL piss off people and I've actually seen people bend antennas because of people doing that. I just park in the back of the lot and get a little exorcise. You make it into the store or whatever just a min. slower- no be deal to me. I also check my car for dings upon returning.
Sorry, I wasnt very clear on that, I meant in the back of the parking lot, and as stated earlier I try and straddle the line, just in case someone does end up that far out. I guess it still could be a risk though.