Flat Tire...@ 8K miles...does this look ok to you? - Event Date: 14 Oct 2016

Check the DOT code on the sidewalls. The first two digits in the code are the manufacturing plant.

http://www.barrystiretech.com/dotcoding.html

http://www.harriger.com/tires.htm

I suspect you are the victim of the China Bomb syndrome. Problems with these tires have been reported and some members have achieved resolution by contacting the supplier, Lionshead. Contact your dealer or Forest River to begin the process. Here's a contact at Lionshead, complements of our friends at the Camplite forum:  bscott@lionsheadtireandwheel.com. You should replace both tires, preferably with BF Goodrich or Maxxis.

I check mine before every trip and after having two blow on one trip, I've considered getting a TPMS.  In the OP's case the pressure was right at the start but a slow leak could have caused the blowout.

I also had two both tires blow out on one trip, one on the way there and one on the way back. They only had about 5k miles on them. I'm also considering a TPMS, although I have more confidence with the D load rated tires on our 179 now.

The second blowout was violent enough to bend back the front edge of the fender and almost completely rip it loose from the trailer. Fortunately, the screw heads tore through the fender and didn't strip out of the body, and our dealer replaced the fender under warranty.