Maybe a little of both, Bob!
Val H - I had a firm piece of 3" foam lining the bottom of the tub for Barley, but noticed he wasn't comfortable laying down, especially on gravel roads or where the pavement was in poor condition. That's 90% of our roads here in Vermont. So I went to the Orvis outlet and got one of those memory foam dog beds. It fit the tub perfectly and Barley is now a lot more rested on our long trips.
I got a sidecar to travel with my dog. He never complains, is delighted to be with me, approves of my dietary choices, is a social butterfly who helps me meet folks, appreciates a good beer, snuggles better than my wife, and hangs on my every word as if it's the most profound thing he's ever heard. TravelsWithBarley.com