Glad to throw my 2 cents in
Hope it ends up helping and good luck
I would use something soft like a large shammy so I can spread out the cards on the hood or trunk of the car. for 3 reasons.
1- less likely to scratch you car ( if it matters to you
2 cards wont slide off the car that easily
3 to show off what I have
or bring a fold up table not that big but if anything to help display the cards
Pretty neat deal.