Had a 10K 24' Haulmark. It was plenty of trailer for towing a Chevelle. Had storage cabinets and a workbench with base cabinets in front which was handy for stowing gear, coolers, etc. The interior workmanship was just ok. Lots of screws that were driven in at an angle (through carelessness, I'm sure) or screws that were overtightened and the heads popped off leaving the panel they were attached to in that area loose. I had the impression that QC wasn't a priority - at least when it came to fit and finish inside - and they must employ minimum wage labor who could care less about the job they're doing. The trailer itself was fine for its intended purpose, though. I never felt it was unsafe. Just cosmetic stuff, that for car guys/gals, can be irritating because you know they could have done it better with some skilled labor and attention to detail.
I sold the Haulmark a couple years ago and have an all aluminum ATC 36' fifth wheel, now. A huge improvement in towing ease. No more sway from trucks, wind, etc. Also, this manufacturer is much more detail oriented when it comes to workmanship.