There is a difference in plows.
Look at my pics. ONLY the weight of the plow is on the ground. Dangling from a chain. That's how a chain lift plow works/floats.
With a rigid ssqa plow like you are thinking, the only way to get float, is to float the loader. That puts both the weight of the plow AND the loader arms, all on the plow.
Yes. You guys are correct. I wouldn't think it would put the total weight of the arms on the plow since the arms are still hinged to the tractor. I would think if the arms weigh 1,000 lbs, you would be putting 1/2 that weight on the plow in float mode. Would you agree with that estimate? Has anyone out there ever scaled the front arms without the bucket to know for sure?