I've never transported that far, but frequently transport.
I use a cat/small dog carrier large enough to fit my 2 together in with room for them to scrunch side by side at the back and ample hay, cilantro, and their water bottle at the front.
I grab a water bottle their used to using, zap strap it to the front of their cage, or use those spring metal clips some water bottles come with (depends if I can find that bit or not).
I lay down a nice thick towel at the bottom of the carrier, then I stick a bunch of hay in there more towards the front and sides. They tend to stick to the back and that's where they will usually pee so keeping the food away from the pee. Sometimes I sprinkle some pellets down, but they usually make a mess and end up burying their pellets so its not worth it. Once I pop both bunnys in, I will put some cilantro in (good for gas and tummy issues) You can give some probiotics like Benebac or Florentero or Acute Care a day prior to transport and the day of transport to help prevent tummy issues. My guys may only be out for a 45min drive, but they have to stay in their carrier for more then 8 hours while being harassed and flipped over by a bunch of students, nails clipped passed from person to person, back to the carrier, then another 45min drive home.
Youll want to make sure they all have access to food, and water through out the trip.