The first one I ever went into while at an RV show had such a soft floor it felt like I was walking on a trampoline. I was standing outside the unit and watched my 120# mother-in-law walk by in the kitchen and could see the floor sagging under that minimal weight. Looked at my wife and told her I'd bet that thing wouldn't last 2 years on the road. Looking at the construction specs, it was clear they were far more interested in throwing junk together to look good to sell, but had little care about making a quality unit.
Some friends of ours bought one and regretted it greatly. Constant structural issues. They dumped it after just a few years.
That said, my wife and I went to a large RV show this winter with my daughter and her husband who are starting the search for a new TT. I'd say that about 90% of what we looked at was not far away from Heartland's low quality construction. Even brands that I thought used to do a good job. Looked to me like nearly everyone was sinking to a low-quality level in the TT/5th wheel market. Clearly, Airstream was an exception, which is why they also sell for more money.
"Second star to the right and straight on 'til morning." Captain Kirk in Star Trek VI 'The Undiscovered Country'
2007 39K Winnebago Journey "The Enterprise"
Jeep Cherokee Sport 4x4