That's why I'm thinking c-channel. The design of the metal would provide strength, but yet still be light/ish. A friend of mine has flats boat thats 14' or so that came with an aluminum trailer with this design. And if I'm not mistaken..it is single axel. It is a very beefy frame and its almost all c-channel. I'm not familiar with the area you plan on riding, but going off of what you are discribing it sounds like you may just have a few hard bumps..maybe. I would look into aluminum a little more and ask around. And start asap on saving weight with every body design idea you have. Just my opinion.
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Opinions appreciated, thanks. And id have to agree that most alum trailers ive seen run C-channel and I beams...hmm. But most are designed for highway also. I will definitely talk to a couple shops regarding alum, and run some numbers.
The area I speak of is just a beach, 60 miles long, no development (no stores, no help). After rain, its nice and mild, sometimes very small ripple bumps. In drought years, its deep soft sand. Sometimes the ruts/tracks are a good 2feet deep. During low tide, its an easy ride on hard pack with the occasional wash out dip to worry about. But sometimes riding low tide isnt an option.
From the feedback thus far, I think scaling back on the whole project is inevitable. I will make some changes, and am still learning sketchup, so will try to get a scale model up to discuss around and not waste anybody's time on my space shuttle sketches.
