Doing a “consumer reports-type” check is a Good Thing, but the real way to assess a trailer’s quality is to wear your “grubbies” to a trailer dealer and take a flashlight.
First, walk around and look at the fit and quality of what you can see. Are seams well aligned? Do the welds look professional? Are gaskets properly fitted? What’s paint job like? Do you see any corrosion? Just be really “picky” and don’t be afraid to write up a “punch list” on stuff you find that doesn’t look right.
Then get under and around the unit in places “where the Sun doesn’t shine.” Look at the same indicators of quality and professional workmanship. One thing to pay particular attention to is workmanship quality in these “hidden” places as compared to open places. Are the welds are professionally finished? Are the seams as well done? Does the wiring look proper (tacked up vice hanging loosely)? If you see similar quality (and that quality is at least “good”) they you’re likely OK. If the hidden places quality is inferior to the open places quality then “run away.”
If there’s an LQ then evaluate it like would would any dwelling house for fit, finish, and overall quality. Use the flashlight here, too, to look behind the scenes and see the manufacturer/seller might not want you to see. 
Even a “quality name” can produce a “lemon” and a “lower end name” can turn out a product that is consistent with price. The odds are, however, that the “name” will reflect the rep. of the company (as that is, afterall, how they got the “name”). And the low end unit will reflect it’s status as a “low end unit.”
Put another way, reputation is an indicator of probable quality but the flashlight is an indicator of actual quality!!! 
G.