We haven't restrained the 70 lbs Weimaraner when we travel. She rides on the floor under my son's feet and there's no way to belt her down down there. Now that we also have the Boston, I'm not sure how we're going to travel.
My preference is to put the dogs, kids and DW in her minivan and have her follow, leaving me in peace in the truck. Somehow I don't think she'd go for that.