A private shuttle service is available for door-to-door service from Frankfurt to Kaiserslautern and back again. Vans and station wagons are available if you have lots of luggage, but book the service ahead of time to avoid long waits. Prices range from €39 to €73 for single and return trips. Inform ahead of time about exact prices at
Van Service Di Liberto (tel. 06337 66 37, www.van-service.de).