I have pulled a couple loaded U-haul car trailers down the freeway 70mph and never had an issue (knock on wood). I noticed with my own car trailer.. If I get up to 75-80mph I can see the tail wagging from side to side a little so I back it down to 70. I tow with a 1/2 ton pick up.
Towing an enclosed car trailer or a bumper pull travel is a different story.
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 Current Pontiacs -
1973 Formula SD455 - #'s auto orig paint
1972 Trans Am - 4 speed orig paint
1974 Formula 400 - Ram Air automatic
1966 2+2 convertible - 421 4bbl automatic
1967 Grand Prix - 4 speed orig paint
1967 GTO - 4 speed orig paint 35k orig miles
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