Thread title alone is worth it.
Yeah, hood ornaments moldering in the grave. The real zombies.
What I recall from towing stories about the '50's was towing speeds in the mid 50's and higher. This is west of the Mississippi River. With the Interstate system growing from 1960
onwards this may have creeped to 60, but not much more or for all that far. Disc brakes show up in 1966
across a wide range of sedans. Peace of mind in that.
Hell, if it's only 300-miles, who cares how fast? Then or now.