If you can find a log with enough diameter to get a few rough-cut pieces the size you need, clear of sapwood and heartwood, take it to a local sawmill and get it cut a little larger in all measurements than you expect to need for the final dimensions. Allow at least a year for the rough-sawed wood to air-dry, then get it planed to final size. The best pieces will come from a "clear" section, with no knots or serious checks or cracks. I floored a 16 foot utility trailer with 3" thick rough-cut hickory almost 20 years ago, and it lasted until last year before it needed replacing. I don't pamper my equipment, so it saw about 18 years of hard use.
Jerry
