You don't want to go to the show the first two days. Wall to wall people and dogs and dogs in baby wagons and more people. Monday things get slower and you can find a place to park near by. As to the boondocking, anything from free with no dump station or water to $40 for two weeks in an area with water and dump station near by. There are gas stations at each end of the interstate and in the center of town. There are three grocers and some little ones around.About 2-3 miles south on the east side is where I like. Water and dump station EZ access and paved roads all but to the camping spots which number in the 1000's. The show goes from a week before to way after but the RV thing is just a week with the major vendors, but the garage sale is for at least two to three weeks, and this is most of the show anymore as the tent is the same as going to the local fair for cookware, foods, insurance, camping spot vendors(imagine that some thing for an RV)and everything one could want not directed at an RV. Still all in all a very fun time. OP you may get in touch with a group of your type of RV or like RVnet or other association for group camping.
LEN