F2 is great, until the roll pins securing the gear to upper shaft fall out, and then the handle flies across the highway..... Had it happen twice so far. Waiting on warranty replacement, which was not a problem. The F2 has 2 plastic wheels, which do not like to track well when repositioning trailer - especially empty. THey love to just rotate 90 degrees to direction of travel and skip along asphalt or make a nice trench in grass. With 2 wheels the trailer is also a little harder to laterally move that inch or two that you need when the truck isn't perfectly lined up with the tongue. The old single wheelers could be manipulated left and right several inches to 'fine tune' when mating to the ball. Much sturdier than the older POS jacks, just not the be-all-end-all.
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