A 72 volt motorcycle conversion would meet your specs no problem.
I didn't see how far you wanted to go at that speed. If it's not real far, 6 smaller 12 volt batteries would make a 72v pack and would fit in a smaller sized vehicle.
I went out for a ride the other day on a gas scooter, similar to a Honda Spree.
Steering and going over bumps was terrible! If you are trying to go 55, make sure to have some good large wheels & tires and good suspension!
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