CampStewart
Observer
First of all you said your axles are 65" wms on the Bronco and 8 lug. Just curious, are these custom built? IIRC stock Ford straight axles in trucks are about 69.
There are lots of exotic materials out there that are very light and have all kinds of wonderful properties. My guess if you have a full size Bronco with 8 lug wheels that saving a few pounds in the trailer construction wouldn't mean very much. I think you need to consider your steel spacing as part of the equation of what diameter and thickness of tubing, and what thickness of plywood. I would think in terms of 1.5 tubing in 13 to 16 gauge on 16" centers with 1/2 inch floor and 3/8 walls. I would use MDO plywood with paper on both sides. Id use a 3500lb straight axle with brakes and adapters to 8x6.5
There are lots of exotic materials out there that are very light and have all kinds of wonderful properties. My guess if you have a full size Bronco with 8 lug wheels that saving a few pounds in the trailer construction wouldn't mean very much. I think you need to consider your steel spacing as part of the equation of what diameter and thickness of tubing, and what thickness of plywood. I would think in terms of 1.5 tubing in 13 to 16 gauge on 16" centers with 1/2 inch floor and 3/8 walls. I would use MDO plywood with paper on both sides. Id use a 3500lb straight axle with brakes and adapters to 8x6.5