Riding free in a vehicle and riding with a harness.
For those of you that do not remember this or the people involved. There was an accident with a full size van and it's attached travel trailer that got hit with some high winds and rolled. 3 adults 1 child and lot's of senjis and 2 malmutes. All the dogs were in crates (kennel aire to be exact) and the crates were bungied down. All humans were wearing their seatbelts.
The only injury was an adult shoulder that got whacked when it hit the one childs childseat. The dogs suffered 1 torn toenail. No imagine that with a dog loose in a vehicle - the dog would be dead AND perhaps when the doggy projectile was flung forward - you would be too - killed by your own dog. Now imagine the dog in a harness hanging in the air upside down neck or back broken by the impact.
Folks I don't care how much they carry on you should have your dogs in a crate when you are traveling. They are not humans they are not playing car bingo - they our both our treasured companions but also our responsibility. You need to work with your dogs until you find a combination that works (like go in a crate and stop and the Dairy Queen - that works for me :))
Please crate your dogs AND tie down your crates.
Sorry - off my soapbox now.