If you're not worried about weight then don't worry about the length. In the scheme of things a 20' trailer is a short trailer. My son is towing a 29' travel trailer with GMC Sierra, dry weight between 6,000 and 7,000 lbs. His buddy, Silverado, is towing a longer and heavier travel trailer, it's at least 35' long.
Any enclosed car hauler should be equipped with electric brakes and that is a necessity. Anti-sway is an add-on that connects to hitch and trailer tongue or can be part of the weight distributing hitch, had that on ours when we had a travel trailer so no additional pieces to fumble with when hooking up.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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