When you take the chins inside with you ... welcome or not ...
always use your own sheet/blanket spread out under the cage and be sure to dump the sheet/blanket
outside when leaving.
Play time should be in the bathroom ... easy to clean up.
Make sure they do not chew on woodwork or furniture ... that could cost you in more ways than one ... it might poison your chin if it has been sprayed and/or certain cleaners leave a residue on surfaces.
Never let your little one play on carpet that is damp ... the cleaners used to shampoo it can enter his system through his feet if it has not dried completely or if it were to get wet again.
Remember ... extra charges can be added to your credit card if you mess up and don't clean up or get caught with them when you are not suppose to have them in the room. Plan ahead!
Place something between the back of the seat or where ever you set the cage ... remember ... chins love to chew!
Plastic sheeting between the area and what ever you use as a spacer between the cage and what is near them during travel. Make sure the plastic is not directly exposed to the chinchillas. They can reach most anything within 1 to 2 inches of the cage with their teeth (not to mention pulling it inside the cage) ... and about 7 feet accurately when they spray. Protect your belongs as well as your chins!
Make sure all items inside the cage are securely anchored in place ... don't take a chance on squishing a chin. Huts can be anchored/secured to the wire of the cage by using 2 large metal O rings and a long screw on each side or 2 on one side. The rings should be large enough to span over at least two adjacent wires. Place 1 O ring inside the cage between the wood and the wire, use the second O ring on the outside of the cage. Having the two O rings used this way assures no slipping. If you use wing nuts instead of regular screws, check them often, they can loosen during driving and transporting.
Dishes should snap into metal holding rings or attach directly to the cage. Water bottles should be glass and not used during the travel time ... offer them water during stops and over night.
I'm sure there are others that will have good suggestions, also.
Jo Ann