farmall m pulling capabilities

My dad once hauled a Caterpillar D6 with blade on a 4 wheel low bed. This was the type of low bed like a big farm wagon designed to be pulled by a loaded dump truck. Dump truck broke down and since my dad was hiring the dozer he wanted it that day. It was basically 4 miles of level road. Dad said the low bed settled in soil a bit during loading of dozer, thus dozer operator had to give a lurch on clutch, so the H would start away with it. Once moving dad went up the black top in 3rd gear. Few little grades along the way, dad said the down grades bothered him more than the up grades. Took them a couple of hours to make it to the destination, got a lot of onlookers through village. Most folks really couldn't believe what they were seeing. The Farmall H looked damn small ahead of that load.

I regularly pull a loaded fertilizer spreader, probably six tons total.

Your question is difficult because an M will pull 10 tons on a hard surface in low gears, but starting a 10 ton load in fifth would be a problem.

Pulling a flat bed trailer in the field is no problem even with 120 bales of hay, thats about 4 tons, and the trailer is less than one ton.

Read the posts above, they were good answers. Your braking capability going downhill is a lot more important than getting the load started. You know it's overloaded when you slide when trying to stop, assuming you've got good tongue weight.

Pulling an implement is never a problem, but pulling it and taking more power for the PTO is. I pull a Vermeer 605 Super C making 6 ft bales 5 ft wide. As the bales gets full I don't have plenty of power.

When you let out the clutch and try to move, you are overloaded if you have to keep releasing the clutch to let the engine gain speed and reingage to keep moving.

All decal sets come with the warning decal "DO NOT OVERLOAD".