I have a wood floor on my car trailer for two reasons, weight and cost. Plus wood doesn't let stuff slide round like steel does. Replaced my floor two years ago with pressure treated pine and Thompson weather sealed it six months after that. Still running strong 2 years later. Would've had to add more stringers running across to support even with 14 gauge tread plate, money, and several sheets of tread plate, more money, and bunch of welding to put it all together, more time and money. So I went with good old pine.
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