An investor group plans to open a 184-site RV park next to the junction of two busy Southern California interstates this fall. Grapevine RV Resort anticipates opening this fall with all 184 sites available for overnight use, according to Madison Fowler, operations and guest experience manager for W. Reyneveld Construction, Inc., which is building the park for the private investor group. “The whole park will be open, but there will be some amenities still under construction,” Fowler said of the southern San Joaquin Valley park, which is being built next…