Longer would be nice, give you some room for stuff. What is the weight of each? You're staring with a car weighing close to 4,000 lbs. I wouldn't worry about the length. Only time that matters is when you have strong cross winds. It's the weight you're towing that matters. Electric brakes, equalizer hitch and anti-sway go a long way. Still you don't want the tail wagging the dog.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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