[Paddlewise] Car-topping vs. trailering? Pros and cons?

I've been toying with the idea of building a kayak trailer.  My problem is 
that, despite whether or not I use a fairing, my Thule roof rack creates a 
lot of turbulence.   I drive a 1993 Saturn and the car is underpowered as it 
is.  Even when I'm not tranporting my kayaks, pushing that extra air out of 
the way is hurting my mileage.  Pushing two boats through the air is 
considerably more taxing.  My thought is that with a trailer I can leave my 
boats loaded and ready to go. And when I am not transporting my boats, I 
won't suffer the wind noise and mileage deficit.    I've read previous posts 
where people have been concerned that trailered boats are more vulnerable to 
damage from rocks and other highway projectiles. Does anybody have any 
experience with going from car-topping to trailering?  Which is more 
convenient? Secure? Is it less taxing on the motor to pull a low profile 
trailer rather than  car-top a couple of boats?  Your thoughts would be 
appreciated.  I have experience pulling long trailers, so that's not a 
factor.   Thanks,

                                            Robb
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