Certified GKH Gardening Expert
The trick is to do so as slowly as possible and pad them well. The vibrations from the vehicle can collapse the air pockets in the soil, which causes damage to the roots and compacts the soil. The slower you can go, the better chance they will survive the trip. Also, make sure that they are well watered before moving them. This will help keep the air pockets intact and the roots padded in the soil.