My favorite "Busy" toys are Dently Chews, Dentastix, CET Chews, Petstages Stick, , Tug Ropes, and Trail Mix.
The kits were kept in this little zippered bags and momma rotated them out so I did not get board with one or the other.
Over all the road trip kit worked out well for me. I had new things to keep my puppy toofer occupied most of the way. My favorite item was the Petstages Antler. It made a few extra turns in the rotation. :)