NHTSA Complaint #11419813 — 2021 GRAND DESIGN REFLECTION

We have taken two trips with trailer and (Tow vehicle - 2021 Ram 2500). First trip in April 2021 of about 150 miles round trip no problems were encountered. Second trip in May 2021 with a round trip of 380 miles we had repeated instances of "Check Trailer Brake Wiring" and "trailer disconnected" appear on dash. These warnings would disappear after a few moments. When safe to do so after first instance (and the warning was off) I pulled off the road and checked connection and trailer brakes by engaging the emergency trailer brake switch and trying to pull away. It appeared that the trailer brakes held. This cycle continued for trip to and from RV park. This month, I made an appointment at the RV Dealer, hooked up the trailer, checked operation of turn signals and brake lights and checked that the trailer brakes would engage. They did. When pulling out of storage lot, the warnings appeared, I tried to engage the trailer brake emergency brake while the warning was still on the dash and found No trailer brakes. I proceeded to drive to the RV dealer and the warning disappeared and brakes seemed to function. While I believe the truck brakes will stop the trailer at slow speeds, I am worried about the situation at highway speeds. Trailer is at the dealer waiting in a repair queue. I had telephoned the Grand Design RV customer service line and was told they weren't aware of a problem. However, a friend with the same year and model trailer but a different tow vehicle has encountered the same brake warning issue.