Don’t you mean Marshall’sYes that's absolutely fine. You will need to arrive at the gate together for simplicity with Warner's. When you get to the Fun area, depending on space, you may not be able to park next to your van.
If you can't arrive together, post back here and we'll advise how best to get around it.
Bringing a car of course means you will have plenty of payload to bring beer and wine for all the other Funsters.
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Just teasing.