Chris, the tractors look good BUT, no ROPS. At least, they have the wide front end.
The flatbed has Hendrickson walking beam rear suspension. That’s about the best that you can ask for when you need traction. The dump truck will probably have a 429 or 460. Notorious gas hogs.
I had some mold problems in my log house. I got a good ozone generator and, it kills everything. It also works for removing smoke and smells.
From your earlier description, I thought that the 10whl truck had a 5 speed with a 3 speed Browny. You said that it is a 15 speed Road Ranger so, that is a different animal. There are lots of vids on driving them. Essentially, you put the button in low and, shift through the 4 gears. Then, you move the button to direct, and shift through the 4 gear pattern again. Then, you put it in overdrive and, shift the normal 4 gear pattern once again.
You definitely have your work cut out for you.