 Never go to a used car dealer right after dropping off a rental with your kids in tow needing a vehicle immediately,  the dealers take advantage therein knowing you're already in a squeeze,  these vehicles are plagued with rear end vibrations,  obviously during design some technician didnt do his mathematical grams/ounces/lbs correctly nor did he/s calibrate centrifugal force correctly, centrifugal is right,  vibration is 55+ mph,  Im not buying any ford explorer's again.