I sell them for $299. The usable length is 44", you can bolt a 2 x 4 piece of wood to the upright, they have been tested at 2000 lbs....17" out from the bucket. Weight is approximately 62 lbs per fork. The standard clamp slot fits the kubota bucket (4310 tractor) perfectly.....I can custom cut the slot if a profile of the edge of the ucket is provided.....from the cutting edge back 6".
I have used this design around the farm for two years.....can't break them! I will sell just the clamp assembly if you want to provide your own 2 x 4 tubing for the forks...and do some welding. $79 per clamp. Those prices are unpainted. I hope I don't get busted for advertising.....I was just showing a good fork design that anyone with a set of torches and a welder can build.