We were amazed at how much space there actually is in the Matrix. We used to camp with a pop-up trailer and our Nissan Quest. Since the Matrix isn't really a vehicle for towing we've downsized to camping with a tent. Well, going from a trailer with the room inside the van for packing was something we were worried about. But the Matrix actually has a LOT of room inside. We managed a couple trips so far and it's been great! We took it on a trip from NY to KY to WV and back to NY and it performed very well in the mountains and on the highways. We definitely feel we have gotten a good buy for a great price on a fantastic car!
The amount of room inside the vehicle is actually pretty surprising. It handles VERY well, and the mileage has been superb.
Side molding would be a good thing, and perhaps a roof rack system.