As long as you poke some holes in the box so the girls can breathe. A number 8 knitting needle is the ideal size to make the holes with.
It doesnt seem to have legal lighting or marking as an overhanging load. Why not put some wheels on it ? I would call this a bit pointless. Especially if the girls concerned were more typical Americans. Wouldnt need beer or Ikea flatpack furniture to pull wheelies.