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Reinforcing trailer chassis

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Hi, I am new to the site used to follow a lot from searching the web, so decided to join. Ride different bikes from sports to Adventure touring to dirt bikes. Addicted to two wheels and then sometimes one. I have a question and hopefully some engineers out there could please offer some advice.

I bought a trailer without seeing it on the word of a family member and guess what the trailer should have come with Lube as I got screwed over. Its a single axle flat deck for 6 bikes with gear. The deck is 15 feet (4,5meters) by 7.5 Feet (2,3Meters). the chassis is 3inch by 4inch by 3/32inch. there is a box section under the chassis where the single axle leaf spring is mounted, the chassis is cracking along were the box section  meets the chassis and then they tried to rectify that by putting in a gusset which just caused cracking along a new area.

I am thinking of going double axle (to spread the loading force) this be mounted along a new box section along the entire length of the chassis. What do you think of this, is this the answer.

The other question is to go Torsion suspension to make a smoother ride when using the trailer unladen with just with a few bikes no gear or stick with Double leaf spring. I have a full mechanical workshop where I can do the work but my ideas of design my not be correct as I have not studied this field. Throw a motor at me and I can sure sort that out. I believe in always seeking out some advice.

Thanks in advance, Brett.

 

 

 

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How much total trailer and bike weight are you thinking about. Standard trailer axles come in 1500 and 3500 pound ratings. Most twin axle trailers have 2x3500 so they can handle 7,000 pounds. That is more bikes than I would ever want to carry. One 3500 pound axle should be more than enough, and will save you money on tolls.

I don't care about unladen trailer performance, I wouldn't worry about it. Just carry a load.

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How much load to you plan on carrying? Do you need brakes on both axles? 

It might be cheaper to repair and sell what you have and pick up a dual axle. They tow a LOT better too. 

I use this on dual axle trailers. Makes a significant difference in the ride both loaded and unloaded. 

CRE3000

Along with this primarily because of the bushings, the stock nylon ones are garbage. A light trailer doesn't really need the extra strength. Nice of you carry heavy loads though.

Shackles.

 

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