Most people can not believe I can fully load our 12k 6'x12' dump trailer with 12' logs with our mini. The trailer has a 6' tall metal framed/ plywood chip box with removable 2 piece top. We only remove the top when loading with cranes.
The trick is to line up the largest logs first. If the mini can pick on end of the log up, it's on! The secret is, the deck height of the dump trailer is so low, compared to say a truck's deck. Some times the mini can only pick up one end of a big log few feet high for a moment. The trick is to line it up at an angle that allows the mini to lift and move forward at the same movement to get on end of the log onto the trailer deck. Then simply go to the other end and lift and push her on. Of course you can not get the bigger logs up high. You presort the load, according to weight/size. Some times we will even use smaller pieces of wood to step up the really big logs. Amazing that longer logs are easier to load due to the leverage you can manipulate. As log as you can continue to put one end of a log on top of each course, it's on. Even near the end you do not have to reach the top, all you have to do is lift a few feet from the end so you can get the end up top at a 45 degree and then go to the other end, lift and push em up, some times using the end of the bmg jib to get it all the way up there.
We refined this technique this winter working on frozen ground. We could not believe we had been cutting logs down to 4'-6' to pick them up and load them in the past.
First log of our load the other day was a 12' x 20" shagbark hickory somewhere in the 1600lb range. The mini could not skid this log due to the tall grass and sand, nor pick one end up more then a couple of feet for a moment. Backed the trailer right up lift and lunge technique. The rest of the logs were the smaller logs of the shagbark and 12" elm logs. The jib on the bmg works great for pushing the upper logs all the way into the trailer, as well as rolling the big logs over to the trailer. In about 20minutes I can load that trailer with 8,000-9,000lbs of logs.
I suppose I should make a video showing this technique as I have not seen anyone else doing it. I'm going to get an arbor trolley to help forward logs to the trailer with the mini so we do not have to skid across nicer lawns. Can I just use my iPhone and YouTube?