In my opinion it doesn't much matter who makes it or when it was made. They are all hit and miss. With a used one you've got a better chance of the owner having identified and dealt with the problems, at least. Don't buy one that "just needs" anything. It NEVER "just needs" what they're telling you. The seller is always hiding other, possibly worse, problems by feigning ignorance.
Why are you so concerned about "1/2 ton" if you have a DRW 1 ton? It's not like you're going to be "fooled" into buying a "1/2 ton towable" fifth wheel in the size range you're looking at. If you want to be sure, count the lug nuts on one wheel. More than five? It's not 1/2 ton towable. Only exception to that rule is if the trailer has three axles.