This looks a lot like the one next to us at a campground last week. Maybe not the same brand, but it allows carrying two kayaks and two bikes off the trailer hitch receiver. That upper cross beam is hinged at the passenger side, so one end of the kayak (don't see why it couldn't be a board) tips into a pocket at the bottom of the rack (near the dog). Then it's a one person job to stand the craft on end and secure with a couple cables and straps. Then close the beam. There are aluminum channels to hold the bikes' wheels then they strap in place too.
If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB