This location charged a $20 flat rate last time I was there. (Not a holiday) First 4 hours free. They have gates at the entrances and exits. Ticket as you enter, Pay as you leave.
20 a day
Some of them truck stops up there will let you park for hours free. And anything more in that you must spend $20 in their store. Even if you pay for reserved parking and it's $15 you must still spend $5 in their store. I do not know if that's one of them or not.
As far as I know the parking vis free it less you please park in a reserved space mist places 14-15.00
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