If you’re ready to plan your next getaway, likely the first thing you’ll tackle, once you’ve picked the dates and location, is booking the vacation rental. And if you’re like most people, you’ll head to Booking.com, TripAdvisor.com, or Airbnb.com — the top three vacation rental sites according to a study by Semrush.com, an online marketing service. These online businesses are what’s known as third-party booking sites. And they may not...