Yeah, a lot of back and abdomen flexing is right. In fact, through all the fat, I almost thought I saw the barely discernible outline of a long lost "six-pack." It's since melted back into my gut, but the back pain is still with me. But thanks for the kind words.
Spaugh, on those two retaining wall trees, I dithered in my mind back and forth about whether or not to use the RBII pots. I concluded that the trees would be larger and happier in the long run outside of the pots, but I also want to experiment more with the pots and compare the results of two trees that I have on the side of my yard (same varieties) with a tarp blocking their bottoms vs. these trees here that are bottomless. I want to see the difference in the two methods. Also, I hold out some hope that were we to move in 5-10 years, I might be able to sever the tap roots below these trees, cut them way back, and relocate them. That's probably a fantasy. Finally, I was worried about the roots of the local existing flora intermingling with the avocado roots and the avocado roots spreading into areas of the raised bed where I'd still like to grow vegetables. Its seems like with the container, I'll have tap roots going down for the avocado but not spreading out laterally. That should allow me to dig down around the avocado pots and sever the invading roots (like I have to do every year) and also not have to worry about the entire bed getting overrun with Avocado roots.
So that was the deliberation I had on this topic.
Mark, why didn't you just create a large raised-bed for your green-house tropics? Why go the RBII expandable container route?