I understand how you load the first round but doesn't it fall out when you open the dual lids to load the second round??
Yes it does, the way I do it, is if there are two pieces of wood like that (or large rock, or hay, or whatever you want to move) I go up to the first one, open the grapple, close the clamp, pick up, drive to the second one....then....position the grapple over the second piece, dump the grapple, lower it pretty close to the second piece (closer to the ground that way), open the grapple (first piece falls to the ground underneath the grapple arm), then lower the grapple in the dumped position over both of the pieces of wood, then clamp and away you go.
There are times when I'm picking up stumps (I often move multiple stumps at a time) where I can lower the grapple, pick one up (lets say on the LEFT side), then drive to the second one, but right before I get up to it, I lower the LEFT grapple clamp onto the next stump I'm going to pick up (which already has a stump in it) and position it so when I open the grapple, only the RIGHT (empty) side opens, then pick up, reposition, and pick up the next stump in the RIGHT side.
It sounds confusing to type, but it pretty quick really. You can't take too much time though because since the clamps share a circuit the closed one will start to open and equalize with the second one, but this happens slowly and with a stump it has enough odd shape to it that you won't drop the first stump. I can't do this with large rocks though.