GRAIN VALLEY, Mo. -- Strong winds and a possible spin-up cut a path through Grain Valley Monday night. Those gusts were so powerful they moved - and even threw - RVs around at one dealership like they were nothing more than children's playthings. The National Weather Service out of Pleasant Hill sent crews out on Tuesday to survey the damage. That included out on Southwest Eagles Parkway where the wind cracked the base of a ten-meter tall power …