You didn't account for it...knowing it's there and ignoring it because you don't know how to estimate it isn't a good excuse.
An 800 lb trailer will not have a pull force of 800 lbs. We put wheels on things so they move easier. Under a steady pull that 800 lb trailer probably has a pull force of about 20 lbs. You are comparing apples to oranges- Hanging the tractor by its drawbar is a steady load (and only applied once if the tractor is being parted) and that's not the same as the loads in question. And just because somebody does something doesn't make it a good idea...there's plenty of people that pick up tractors with a forklift and a chain around the steering column, but that's a really bad idea because it ruins the steering column.
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