Also, if you dont want to bother wrapping boxes, just tuck them under your tablecloth or use another tablecloth or napkins to cover up that box. I'm the queen of cheap and easy! LOL
Also, try to pack some of your things in the smaller boxes you want to use for height. That way you are not just taking empty boxes around with you. (Ask me how I know this?!) Also, get boxes that are sturdy and are truly going to fit in the area you want. I almost always stage out some ideas before a show....bring in a folding table, put on the tablecloth, play with the boxes and arrangements of items, etc. This helps a lot when you are setting up....I even take pics on my phone if I remember so I can just pull up the pic to look at.