A trailer frame material? There's a 24 foot 2 / 6C channel 8 foot wide, already prefabricated to be conform to what you want, second trailer framework. Older, but rebuildable has axles and tires on it. A third I was going to build a tilt deck trailer. I also have heavy duty steel axles. Some are manufactured. Some are 6 lug, bolt, 2 mobile, home tongue frames.