Wow Dan" We did rotate and balance your tires and the tech test drove it to 55MPH that was as fast as he could get up to due to traffic he didnt feel anything at that speed but we didnt charge you for it look at your invoice " We also put the truck on the alignment rack connected the heads and found the alignment was purfect so we didnt charge you anything for that as well" Im sorry your disapointed but in a situation where we need to exceed the speed limit to duplicate a problem" I suggest you stop by and we will have a tech ride with you while you demo the problem" Vibrations at highway speeds are common on the Sport Trac's if the tires are ok along with the balance we usually find a worn transmission tail shaft bushing causeing the drive shaft to be unbalanced , a new tail shaft bushing normally helps this condition" We will make every attempt to contact you and help resolve this issue"Larry