The measurement you made "2 feet out" in front of the tires would only be valid if the tires were exactly 2 feet in diameter, although I'm sure it was plenty close enough for a tractor application.
The normal method for measuring toe is at the front of the tire and the rear of the tire, as close to halfway up as possible. Laying a flat board or other straightedge along each tire like stated is accurate to measure from too, provided they're secured or held so they don't get moved while measuring, and also provided the rims arent bent and there are no bubbles or bulges in the sidewall of the tire to throw off the measurement. In the shop I did alignments for back in the "pre-computerized alignment machine" days, we'd jack the vehicle up and spin the tire while spraypainting a line around the center of the tire, then spin again and scribe a line all the way around the tire and measure from that, but the boards will be plenty accurate for a tractor.
It's also a good idea to drive or roll the tractor forwards a foot or so to make sure all the slack in the steering is taken up before measuring.
And yep, that F-12 should have a little toe in, 1/4" or thereabouts should work fine. Doesn't have to be precise down to hundredths of an inch, just so it does have some toe in, which of course is where the front of the tires are pointing in slightly(front meausrement 1/4" less than the rear.
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