I would like some assistance in determining what would be a better option for me and my family. We are arriving in Frankfurt June 15 and will be renting a camper from a company in Neustadt/Wien approx 120km away from the Airport in Frankfurt. They have a dropoff/pickup service but it will cost about $500US. Is there a cheaper way by private transport (taxi or bus) that anyone would recommend? What would it cost? Thanks very much!