Please correct me if I'm wrong.
Getting a trailer with a better quality frame means less chance of failure. I'm sure there are many people who have successfully lived full-timing on the trailers with lesser frames but the chance of experiencing frame related issues will be greater on those. The question for the individual is, how much are you willing to pay to get that additional safety margin.
Personally, something like Cedar Creek is more than enough if I only look at the surfaces and it costs significantly less than the likes of DRV, Excel and Lifestyle. But I'm hoping to use it for 8+ years and I'm looking forward to drive it all over North America hence at least in my case, the extra cost is partially justified.