The wood blocks are to simulate the look of the elevated front ends on the cars at the old drive inns. When you would pull into your parking space they were elevated for the front ends of the cars to be up for screen viewing..
I asked the same thing when we were setting up... LOL...
Rich
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"This is Sheriff Buford T. Justice, I'm in pursuit of a black Trans Am, he is all mine so stay out of the way"
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