I put down indoor/outdoor carpeting when I had my pickup truck and it kept them from slidding around. I also put some cheap padding around the sides. Crates would have been impossible for me because when I had my pickup truck (with top) I also had 7 dogs. Now I only have six Although I don't have my truck any more I do have use of my d-in-laws mini-van so it's still possible to take the dogs to the country and/or the beach