In a Volvo wagon of course! Thankfully our little Bettie Beige (who isn’t a wagon) doesn’t have to carry home a Christmas tree this way, we go the fake tree route. It’s just less messy and the cats are less-inclined to want to eat it.
Plus, I wouldn’t trust Puddy cat or Merlin to safely get the tree home! Not with the way they argue in the car.