About the only time I drive my truck is when I'm pulling my 40' fifthwheel. I used to put the bikes on a rack on the back of the camper until the Yakima rack had a weld break and I lost 4 bikes on I65. After that I rethought the way I carried my bikes so I put them on the top of the truck now. This picture was taken just before I went out to the barn to hook up to the camper.
I usually have them on top of my car since it is usually just me by myself or me and my boys.