I don't know whether you have a pick-up or SUV, but I have a mount (on my pick-up truck) very similar to this

http://www.amazon.com/Yakima-BlockHe...8557571&sr=1-1

It doesn't have a security lock to prevent theft but it holds very well. The only thing is you have to be creative depending on the type of pick-up you have. I have a Tacoma where it came with rails on the perimeter of the bed for tie downs. I bought my mount from a LBS and they gave me tips on how to install them on my truck. The mount is very secured. I drove 300+ miles (going 80+ mph) on it to my brother's place and the bike never moved.