This is my mini fork lift. it's tested good up to 1000 lb. The forks need to be better cause as Bunkclimber said they will bend. these tend to flex with a full load. this pic also shows my hitch ball attachment.. I use it more than the forks. I drilled a hole through the ball-mount bracket and the top rail so I can pin it to keep it from lifting off if I'm hooked to some thing with negative tong weight. (not shown in the pic)

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[Linked Image from live.staticflickr.com]

My counterweight is hung the same way.
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This is another useful attachment. I've added a gusset for more support since this pic.
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I know a lot about a lot of things BUT I still have a lot to learn.
Life is what you make of it. So, why not make a working machine to make it easier.