I have never traveled with rabbits, but I have heard that it isn't a good idea. Unless your rabbits are used to going places, I think they would be better off with a friend. My rabbits are outside, but when it gets hot, I bring them in the house and they stay in a dog cage in my room, where they get the attention of all four of my cats and our dog. They have gotten used to the house pets. They are happier outside, but survive just fine in the house, although I don't have room to give them out of cage time like they have outside. When I go on vacation, my niece takes care of them. She has a dog that can't be trusted around them, so they stay in a cage in the garage and she walks them on leashes.
If you really want to take your rabbits with you on vacation, it might be a good idea to try taking them with you on short trips to friends homes etc., and on car rides just to see how they do, and get them used to traveling.