I'm going to be taking delivery on a Heartland Bighorn 3600 RE around the first week of May. I've been reading these posts about the Lippert frame failures. Heartland uses Lippert frames. I'm wondering if I should be concerned about this or are these isolated problems? Are the frames failing on certain sized trailers? I've been told that the Heartland Bighorn frames are being made to better standards currently than in the past.