Go down to your local semi parts distributor. A lot of the class 8 semis have air ride cabs and have special small air bags just for that purpose. Ask them to browse the shelves and tell them what you are doing, you'll find it.
I have used those "lowrider" air bags you are talking about for exactly that, we used to do air ride suspensions. Those are way bigger and stiffer than you need for a cab.
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