Harry Ferguson invented the multi-component Three Point Hitch during and after WWI. He obtained international patents mostly in the period 1932-1936. When implements are mounted on Ferguson's 3-Pt., most of the implement weight is transferred to the tractor's four wheels, improving traction.
Prior to Ferguson's 3-Pt., which included hydraulic lift, Draft Control and centered PTO, implements were often pulled with chains, and tractors, though commonly weighing several tons, often went vertical, then toppled over. With the 3-Pt. tractors could be much lighter; viz the Ford 8N, 9N, etc. ( Fergunson's first major licensing agreement.) Ferguson's patents expired, serially, in the mid-1950s.
Utility size tractors usually include Draft Control as standard equipment.
New plows sold for smaller tractors, which commonly do NOT have Draft Control, have either a trip mechanism or shear bolt protection to decrease the chance of a vertical tractor.
When skidding timber from the drawbar or cross-drawbar you have little or no load transfer to the tractor.
As I was learning about tractor operation I once got a Deere 750 (20-hp) completely vertical when skidding logs from a cross-drawbar. Luckily I had my seatbelt secured. Pulled log stopped against a protruding root and the tractor pivoted around the rear axle in 1/2 second. I NEVER want to repeat that. So, you should elevate the tractor ends of logs being skidded 4" to 6".
Two of use detached the logs and used the chain to pull the tractor back to horizontal without damage to the tractor.
Drawbar T-frame in photo is from OMNI Manufacturing.
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