Give them a call
I'm sure they'll be more than willing to assist if you ask.
There is a cart dispenser right before you enter the terminal entrance right at the end where you drop off your car. Carts are $6 with a 25 cent refund if you return the cart. If there is a ling line, you have plenty of time to get out of your car, go get the cart, and bring it back to your car. Depending upon the size of the suitcases, you might need a second cart.
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