I think a trailer does not need to be fancy at all, if fancy means cool paint, polished diamond plate and so forth.  And a trailer does not have to be super stout either for most users.  It is the guy that is near the GVWR limit that hauls often that can use a better built trailer.  Like the Diamond C 48HDT is an I-beam construction trailer.  Makes it lower and very strong.  The 45HDT can be had at the same rating, and it is a pair of stacked channels.  Also very strong, a few inches taller.
My first trailer years ago was so awesome.  Why?  because I didn't know any better, and truth be known it never let me down.  It was a cheap angle iron frame, tandem axle with no brakes.  I pulled it around and loaded it stupidly on occasion.  And for that usage, it worked fine.  I did not understand 25 years ago why the inner fender spot welds would always pop.  I did not realize the frame was flexing that much.  It worked, and worked fairly well and it was cheap.  What I am saying is that these heavy duty very strong industrial grade trailers are not needed by many people.  Especially occasional users.  It doesn't take a lot of trailer to haul a 4000 lb tractor to the shop occasionally or to go help a buddy.