An A frame, by geometry, is diagonally braced. Diagonal bracing is necessary to stabilize most any x,y (height,width) structure.
On a trailer the A frame could allow for more strength/stability while allowing for lighter material and it doesn't take much of a diagnonal brace to work.....like on a barn with a 12' cieling and poles spaced 10' apart a X made from 2 .050" by 1.5" straps on each of the 4 sides makes it solid as a rock where otherwise it rocked back and forth when you push on it.
So, It depends on those specific trailers as to which is better; difference depending primarily on materials used and method of fastening.
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Today's Featured Article - Box Plow Blues - by Tom Schwarz. One of the first implements most tractor owners obtain is the box plow. For very little money, this piece of equipment promises to plow and flatten any hill or vale on your ranch road or farm. At least that's what I thought! As simple as a box plow appears, it can be rather challenging to make work correctly. In our sandy soils of Florida, traction is king. You can never have wide enough tires or heavy enough weights to get all the traction you want … unless you own a monster tractor. U
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