I just moved cross country with 4 buns, and drove 8-12 hours a day. Oof!
I would have some critical care, simethicone, and fluids with you. Have some favorite greens in a little cooler, and half way through the trip take a long-ish break (at least 30 min) and offer wet greens and some hay. I never syringe fed during the driving part as I could always get them to eat even a little greens, but did have to syringe feed one of my girls morning and evening after about day 2. If they don’t perk up and eat their hay and salad in the evening after the trip, syringe feed and give some fluids. Even my girl who wouldn’t eat during the trip (and barely pooped) started eating just fine once we got to our destination.
I’m sure they will do great! My bunnies actually really surprised me with how well they handled everything.
Side note, if they travel together in the same carrier you might have them nearly bonded by the time you get there. 😉
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.