Make sure to pack some hay in the carrier. When I take my two pairs on road trips I set up the carriers like litterboxes right before the actual drive--newspaper on the bottom if I have it, then a layer of wood stove pellets, then a layer of hay. When I arrive, the top comes off the carrier and fresh hay is added and it serves as their litterbox during the stay. Right before we drive home again, the box gets changed. I have done 7-8 hr drives and 12-13 hr drives this way, and rarely if ever does somebody stop pooping or eating. If they do, within a few hours of calm time at the new location, with some fresh greens, they're back to 100%.