More pictures. I think I am limited to 5 per post.
These pictures describe the location of the tubs along the trailer. This goes back to my "math" a few posts up with where I moved the axle to. I have the rear tub behind the "center point" of the axle (the axle being centered with the tub). I still have some room to move it back, but the way the weight worked out the locations were good where they were.
With the scenario I mentioned in the previous post of having too light of a hitch - I could have moved the tubs forward to alleviate that as opposed to moving stuff from one tub to the other. However, it was a lot easier to just transfer the stuff. On a tour where I had things organized in the tubs and may not want to move things between tubs then moving the tubs themselves forwards or backwards is certainly an option - it just takes more work to do so (which is why I didn't do it today). Moving the tubs would have helped out with the flexing of the frame, perhaps, more than just moving the stuff as it would have shifted the overall weight forwards - with the weight still concentrated more over the axle and maybe a bit behind.
Edit -
One more note is I am using 550 cord for the tie-downs also. I have a double acting truckers hitch (3:1 ratio I think) to tension each one. It works great. I have a bit of extra cord than I need so I can secure things on top or if I have to compress stuff inside I can. It is about as quick to work with as the ratchet straps earlier and is plenty of securment to keep things from bouncing off and moving around going down the road.