What a bunch of fuss!
You can pull all the weight you have traction for. I pulled a bigger single axle trailer piled high with good old Wisconsin hardwood, with tire chains on my 1450, no issues! More tongue weight means more traction.
Remember we ARE talking vintage Cubs, you have plenty of frame and overall substance to pull your load and more!
What you can't do is "pop" against a static load, like skidding a log. That WILL stress out your bolts on your hitch\tranny cover.
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