Also for all you dealers out there remember you guys are also targeted at shows. A blanket or a lining to your box to keep the inventory hidden on the way out would be well advised or even putting your cases in an old moving box or something and be aware on the way home or way back to the shop.
Some people dont like guns and thats definitely your right, but even without them theres a lot of little things you can do to keep the attention off you and make it more difficult to be robbed. Robbers want easy scores, but if they see you walk out with a box full of visible gold or graded coins theyll think high value and put more money into it. If you do like guns or have them a lot of states let you carry in the car without a concealed permit as long as the gun is visible aka on the seat next to you. Check with the state of the show and the local laws first though