Traveling w/ cats

Do you have ideas to make a place for my cats litter box while on the road. Haven’t gotten a vehicle but looking for ideas for when I do. Thanks in advance :smiley:

I imagine maybe a little custom-built drawer under the passenger seat or a snug compartment behind the driver’s seat, something that’s easy to clean but also gives the cats privacy. Maybe some kind of slide-out tray lined with those little mats that catch the mess?