Hiya, Mikey! So great to see you. Ahhh, getting the breeze, isn't it great?!

I have the harness attached to the strap which clips in to the seatbelt, for my dogs, as well. I also bought one of these:
http://www.myoutwardhound.com/oh00679.html

This way, the dogs don't fall to the floor if I brake suddenly. Also means I can put things out of dogs' reach, UNDER the hammock.