Well, it's been 5 months already! I've made some progress on the truck.
This past weekend was 107 degrees F out at the ranch. So I'm glad it was also the first successful fill of the tanks on this truck.
1000 gallons of water REALLY makes the truck squat down. I'm scared the tires are gonna blow...

I've replaced pretty much every single piece of the brake system. Master cylinder, hydrovac unit, lines, fittings, cylinders, shoes.
WHAT. A. PAIN.
The brakes do seem to work okay, just not super stiff on the pedal.
I've got three Honda/Banjo pumps. Two bolted onto the back of the truck, and one portable to fill from the pond. Built up a sprayer bar with a nozzle on each side from PVC that runs off of the 2" pump, and a 1" pump runs a regular garden hose.
I'm still tinkering and working on it when I can on the weekends.
Here's some pics, and links to videos on YouTube
Video 1Video 2