Yes, you can tow much more than you can haul. For instance, a typical 1/2 ton pickup can legally haul about 1700 lbs. That same pickup can tow 10,500 lbs.
And like Mech said, I wouldn't take this 100 mile trip with a bumper hitch. Maybe if the yard was just around the corner, but not on the Hiway.
Edit: I'd wait for your 3/4 ton to get fixed.







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