Sir_Osis_of_LiverDad hauled a 30' 5th wheel all around North America in a '95 Chevy Cheyenne 2500. Regular cab, long bed, 5.7L with manual transmission and 2wd. It only had 200hp, but he had no issues running at highway speeds.
That would have been really close in size to that '65 F150, closer than anything on the road these days.
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