A truck bed extender is a good way to make your own. About $69 at Harbor Freight. Just invert the top part and you have a double tree. Easy to add a boat winch or electric and blocks. For heavier use I would reinforce it and add a swivel section for loading.
"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli
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