It's just as easy to back out as it is to back in, so it's usually nose in for me if there is no slope, then I face up hill. I'm paranoid about finding my bike knocked over in the parking lot too, so I always leave the bike out far enough that it can be seen by cager's looking to grab a parking spot. I learned from others not to pull all the way in to a space. I think it was 1978, I came out of a grocery store and saw a guy trying to pick up his KZ400 after someone knocked it over, I helped him pick it up of course, and got on my LTD400, and road home, then a few years later, I helped someone else pick up another KZ400 for the same reason. Sometime after that I saw a Yamaha on it's side but left it alone since no one was around, and I was in my car, (didn't want anybody to think I did it). All three of those bikes where parked all the way into the spot.