Memorial Day weekend has long been considered the unofficial start of summer. In 2013, AAA estimated that 34.8 million people would drive 50 miles or more on that holiday, and vacation traffic only gets worse by the Fourth of July and after, when the weather really starts to heat up. Anyone who lives near the coast or by a lake knows the roadways become gridlocked with RVs and campers, trucks pulling boats and jet skis, and cars saddled with roof-racks carrying more bicycles than you will find at the Tour de France. Where is everyone going? Camping, of course. Spending a week at a campground in the summer…