Strenght of Square Tubing on a trailer

AI Thread Summary
The discussion revolves around the strength of 4" x 4" x 3/16" square tubing used as main beams in a three-car gooseneck trailer. The poster expresses concern about the structural integrity of these beams, especially given their length and design. They note that the welds appear deep and well-penetrated, which may contribute positively to the overall strength. Input from the community is sought to determine if this tubing size is adequate for supporting the trailer's weight and functionality. The conversation emphasizes the importance of assessing material strength in trailer construction.
Bluewater0650
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I am considering purchasing a type of three car gooseneck trailer. The question is the "main" beams of the trailer are 4" X 4" X 3/16", this seems a little flimsy to me. I measured them and they are 41' long then take a 43" jog vertical, then another 50" horizontal. Typical goosneck style,the welds are deep and well penetrated
I have included some pics, and would greatly appreciate any input
 

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I guess I should have been more clear. Does 4x4x3/16 seem strong enough as the main support of a unit like this?
 
Thanks, for the input, very helpful group here
 
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