My uncle has a dog box for his working labrador. It's a "Hound Man Delux". He keeps cedar chips on the inside for insulation. I don't think he bolted his to his jeep because he often ties her out in the shade and she likes to stay in the box. The only bad thing I noticed about it is that the inside is made with some kind of wood (unless my uncle put it in there) and she chewed on it, but she is in this box a LOT (travels everywhere with him) and she's a major chewer. She chewed all over her old VeriKennel. She is a little bigger than my GSD, maybe 65-70lbs.