Welding alloy is problematic because it ruins the heat temper of the material...thus is losses about half it's strength.
My all alloy tilt trailer for Tornado is completely bolt-up. Made of 2x3x1/8 except for tongue which is 4x4. I also use a Torflex axle. Word of advice, don't finalize the axle location until you've loaded up the trailer with boat/gear/box. You will want to fine tune the axle point to achive 10-20% tongue weight.
Mike.
In one of these posts, welding was mentioned as a means of construction. I would really try to avoid welding and see if you can have all the connections designed for thru bolting with gusset plates. I would really worry about the welds (or material around the welds) cracking over time. I think in the end you will have a trailer that lasts longer if you avoid the welding.
Otherwise, I like the design and have actually drawn up something very similar. Just haven't had a chance to get it built yet...
TB
