Last one that I looked at a week today, the sides only had a couple flat bars stiffing up the lower side panels. Defiantly a area that needs attention to stiffen up.
Depending on the j wrap metal you do not want to put to many supports in or as the trailer flexes it could wrinkle the j metal they tend to use 040 thickness metal and that alone does not need a lot of support. The fender skirts on the other hand may need more support but is not uncommon for the fender skirts to be a little lose or swing free in most brands of trailers.
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