I bought a trailer load from SE SD (carlsoncl neighborhood)  which have features that I like and don't see on many that are advertised:  

     Pipe frames the entire panel,  (Many don't have it on the bottom.)

     SIX sucker rods.  Can't get heads through.  With pipe on top and bottom makes 8 cross members.

     Three uprights in between.  With two ends, that makes total of FIVE.

     Since 5 uprights, legs are on uprights 2 and 4.  i.e. ends free of legs!

     Bottom pipe is close enough to the ground that no squirrelly cow can get their head under......

     All sucker rods are ran through holes in pipe.  No welds or clips to come loose.

     Hinged for gate attachment (but that.s pretty common even on the poorly designed (imo) panels...)

At the time I bought these, for all the extra features they only ran about $15 above the others.  Glad I bought them.  Wish I hadn't misplaced his name and phone number!!  Anybody know who I am talking about?  Is he still making them?  Thanks