Label everything! Bag it, tag it, save it!

I used to have a furniture restoration business. I learned the hard way to keep everything that comes off a project until you're finished. Label everything. Put small items (pulls, hinges,...) in zip lock bags or glass jars and label what's in it and where it goes on the trailer. Number the drawers and doors. Then write the corresponding number on the frame of the cabinet. Just write it somewhere that won't be seen when they are installed. This will make putting the trailer back together much easier.