I have had a haulmark and now a customized United. I had it custom made since I have a cabinet shop I wanted to obviously haul but also wanted to camp so I had one with the side tent with 30A electrical power, TV sound system, awning, LED lights, loading lights, A/C, heat. Has 2 motorcycle chaulks with tie downs all over. Covered in carpet for camping. 2014, 14' V nose. I ended up putting it on Craigslist since wife wants around a 28' regular RV and I have other trailers to haul...point is I really like this trailer and you can get just about anything you want on them. I'm sure other trailers can be customized also. I know ATC can be because they sold them where I got this one.
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This isn't much help but two weeks ago I was given a new enclosed trailer for my shop to do some interior modifications for their business. I had to also fix some exterior problems straight from the manufacture..quality definitely wasn't there. But quality, good or bad, is pretty evident on enclosed trailers.