A couple things come to mind:

- 1/4" wall tubing seems extremly heavy given the application. I think most trailers would be in the 1/8" to maybe 3/16" range. I would look at other trailers for a basis of design.

- It looks like all the tubes are on the same plane, i.e. nothing sits on top of anything else. Is that correct? Then, based on your sketch, your front crossbar is actually two pieces. Is that correct?

- One thing that sticks out to me as being "not good" is where you bring the A-frame in to the front crossbar. Personally, I would have that connection be directly in line with the longitudinal beam, that way you resist bending of the front cross bar.

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