In paper Mario the thousand year door how do you move the trunk in twilight town?

You don't. You use your recently found tube ability to roll under it. You obtain the tube ability by using Koops to grab the key on the other side of the trunk. Use that key to open the door to the shop in Twilight Town to get to the storage room. There are lots of small chests in the storage room, but the one you should be concerned about is the black one. It will ask for a key to open it. The key is in the abandoned shack on the Twilight Trail. Use that key to open the chest and the monster inside will curse you with the tube ability.