I am a big fan of car topping when your vehicle has provisions for securely mounted racks. It seems to be getting harder and harder to get decent roof racks these days since cars are getting more and more aerodynamic. But if you have good racks, the biggest advantage (to me) is that I believe it is much kinder to the boat. Light dinghys get the crap beat out of them on trailers. Even with soft springs, a trailer hitting a pothole at 70 mph launches the boat and trailer into the air (watch the next laser/sunfish you see on a trailer on a rough section of highway). If you are just moving the boat down the street to the ramp, no problem, trailer away. But for long trips, particularly if you will have bad pavement (I-95 corridor, most any stretch of interstate in Pennsylvania), the car's suspention will be a far smoother ride for your new boat than any trailer will be. Plus, you aren't kicking gravel up at your new hull.