A spacious carrier: A puppy or cat carrier with an easy entrance from above will give the rabbit more room and allow a less stressful entry into the carrier
Familiarity: Allow the rabbit to become accustomed to the carrier at home before travelling e.g. place the carrier in the rabbits run with bedding or treats inside for the pet to explore
Keep the car cool: Rabbits overheat easily, and this can cause stress. Try to park the car in the shade and/or ventilate/ air condition the car well before travel.
Drive smoothly: If possible drive smoothly, rabbits are easily alarmed by sudden car movements breaking or bumps can alarm a rabbit
Provide toys and/or food: In the carrier to keep the rabbit occupied during the journey