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I have built and repaired several trailers. The one you are building seems like a large trailer that is using too small of steel. On one of the 6x12's (single 3500lb axel for 2 four wheelers) we used 2x3 rec tubing but it was 3/16 wall and the crossmembers were 16" OC. A buddy of mine is an engineer and he wanted to put sides on his flatbed trailer and after working calculations and what not he speced out 2x2 1/8 angle. After we arrived at the steel supplier and he looked at the 1/8 he decided on the 3/16. He has always told me that even after all the calculations are done you need to step back and look at what you are building. If it doesn't look right forget what the calculation say, you need to go bigger. I still think the 3/16 is too small but it would be better than the 1/8 you have speced.

Just my .02.
 
I went in to the place to buy doubles and he was the one that said I don't need them so I don't know. It has to break the safety chains before it can cross the line, I always put heavy chains on them. It's only going to hold 2 stand up jet skis most of the time, if some buddies come along then 4 at less than 300lbs each.



Mine stay inside and usually don't get pulled in the winter so no salt, I close all ends also.



My 20' double axle is built out of the same stuff, it is over 10 years old and is in great shap. I inspect the welds once a year and no cracks.



It's kind of specialized so it's hard to get ideas from a normal trailer sales place. It's being built for four stand up jet skis, two front to back and two side to side.

As far as over loading it, it will never happen. This is going to be my 7th trailer so I have one for each need.

I did get the extra steel for the braces though, I'll hopefully start welding things up tomorrow.

Any ideas on running the wiring? I'd like to protect it a little. My last trailer I ran the wire inside sch 40 pvc under the trailer but after 10 years I've broke some of the PVC and it's a pain to replace. I was thinking about routing it through the frame rails but it would have to be before I weld it and I'm thinking it would just melt the wires.

Any ideas?
You ask us for our opinions on the design of the trailer, and we all give some good advise based on our personal experiences and all we get is flack for it. As far as I am concerned do what you want, when it breaks I hope you have a good lawyer because you will need it.
 
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