Anyone have a link to a website giving tractor load ratings for tires & air pressure requirements for those load ratings?

Some of the o.m. don't have much tire info, especially older ones.

I also assume that any tire mfg would give the same load rating & psi requirement depending on ply rating (star rating)? It would seem to me that the load & tire pressure would be a recommendation of tire mfg & not so much the machine it's mounted on...right?

Thanks