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You might also want to ask your vet about trazodone. I’ve tried gabapentin with my cat but it doesn’t work well for him. (I had been trying to train my cat to get used to his soft-sided carrier and for airplane travel, but he was pretty much back to normal after 4/5 hours; the effects of gabapentin are supposed to last 12 hours). A friend of mine told me he uses trazodone with his dog as an anxiety medication, so I wonder if it may be helpful for cats as well.
Also, if you haven’t tried this already: putting a thin blanket over your cat’s carrier (so they can’t see their surroundings) while transporting them decreases the stimulus they’re exposed to and can decrease their anxiety. This has helped with my cat. I put the blanket over his carrier before I leave the house and the whole time I the car. I just discovered this recently and he almost never makes a peep while on car rides now. I am working on increasing the amount of time he is comfortable in the car (in his carrier). I suggest a thin blanket so your cat doesn’t get overheated, which would not be good especially if your cat tends to pant from anxiety already.