I believe it must be the storage yard for the campground that is across the highway. Here is a screenshot from Google Earth. The truck is inside the red circle. The empty boat trailer is inside the blue circle. The red arrow points to the entrance of the North Beach Campground.
2013 Silverado 2500HD LTZ CC 6.6L Duramax Diesel
2014 Sunset Trail SF270BH
Holly & Buster, mini Dachshunds
2016: 1 trip, 3 nights in 1 state, 316 miles
2015: 5 trips, 18 nights in 3 states, 2707 miles
2014: 5 trips, 14 nights in 3 states, 2426 miles