I've used the canine friendly Vest Harness on Gracie for the past 4 years, and have always been happy with it until I started reading all of the pet safety previews. I used to use it along with a Solv-it booster seat, but was very concerned about the set-up of it and Gracie's safety. I just installed a Pupsaver Air 25 last week, as they have passed a crash test, and I think it's probably a lot safer than what we originally had. Maybe it's not as safe as a crate for the cargo area, but when we travel 12 hours on vacation and the back of the SUV is loaded up, I really don't have any other choice.
When I bought the Pupsaver, they were also sending a FREE safety harness along with it. I have to say, it think it's well made, and it has webbing all along the inside of the vest part, along with metal closures. I think it will work well for her once I get her used to her new set-up. I really do like the Vest Harness, but unfortunately, the one that was crash tested, I think is called a "safety harness", doesn't come in a size small enough for Gracie. I did order one last year and was very impressed with the sturdy construction of it, but the smallest size they had was still a bit large for Gracie. I sent a note to them to see if they would be considering making them in a smaller size, but they will not be perusing that.
If you're interested in the set-up that I purchased, I got it at www.mightymitedoggear.com
and they were very patient and helpful. I am going to try to post a pic of Gracie in her new Pupsaver car seat, but she wasn't wearing her new harness at the time.