Here are a few pictures showing one of the ways to unload a truck when the wood is getting rafted in the water. A frames used to be common in SE AK. for logging close to shore and they were also used for unloading trucks. These pics were at Jim Campbells camp at Little Naukati on POW in 1979.
What you can't see at the top is a crosspiece about 3/4 the way up and a top piece, they are both notched and lashed heavily with 3/4" line.
Wish I had better pics, but see the line on the far right that goes out into the water, that is the snap guy that is strictly a safety guy that is anchored and is supposed to keep the a frame from coming over backwards if for some reason the spreader bar is pulled all the way to the top and then some. They normally would lift the load with the mainline untill the bunks were cleared and then slack the haulback which would let the load drift out under the tip of the A frame and it hung out a ways over the water. Then both lines were slacked and the load was lowered to the water. Toggel hooks held until the load hit the water then fell off when they got slack. Notice how the left leg is gouged out from the spreader hitting it. That and the snap guy have a place in "the rest of the story".
What you can't see at the top is a crosspiece about 3/4 the way up and a top piece, they are both notched and lashed heavily with 3/4" line.
Wish I had better pics, but see the line on the far right that goes out into the water, that is the snap guy that is strictly a safety guy that is anchored and is supposed to keep the a frame from coming over backwards if for some reason the spreader bar is pulled all the way to the top and then some. They normally would lift the load with the mainline untill the bunks were cleared and then slack the haulback which would let the load drift out under the tip of the A frame and it hung out a ways over the water. Then both lines were slacked and the load was lowered to the water. Toggel hooks held until the load hit the water then fell off when they got slack. Notice how the left leg is gouged out from the spreader hitting it. That and the snap guy have a place in "the rest of the story".