Grand Design Reflection 303

Hi all, us two newbie's have just purchased a new 2016 5th wheel Grand Design Reflections 303RLS and the trailer is magnificent. However, a problem with the Westlake ST225/75R15 10 ply "E" rated tires might be an issue. On our first trip on 4/30/15, and no more than thirty-one miles from home, the drivers side farthest back trailer tire BLEW out! Lucky for us I could pull over on an exit ramp right away. We called our dealer and they gave us the number for road side assistance. After thirty minutes of the road side assistance "company" putting me on hold, I let the lady know what size and load range tire we needed. Four hours after the blowout, we were back on our way to our destination. Unknown to us, the tire put on the trailer was a truck radial tire! The tire held up, but I will recommend paying very close attention to what tire is brought out for replacement. So, after getting back from our short trip, the work began to get a replacement tire and to no avail. There are no Westlake tires to be found in Oklahoma, period. We have had to contact both the manufacturer and dealer to hopefully get a wheel (which has a small dent on the inside of the rim) and tire replacement. The saga continues as of this posting. Good Luck to anyone with these type tires. We may be replacing ours very soon.