Colors are mostly for making the chart easier to visually follow the routing, though some factory hoses may be marked with the corresponding colors via a stripe on the hose. I venture to guess the solid colors are constant vacuum and broken colors are "triggered vacuum" or "off idle" vacuum from...
I have had this one for quite a while, pretty happy with it. I like the portability of it.
https://www.homedepot.com/p/RIDGID-4-5-Gallon-5-0-Peak-HP-ProPack-Wet-Dry-Shop-Vacuum-with-Fine-Dust-Filter-Expandable-Locking-Hose-and-Accessories-WD4522/100638389
You can lift the body with the front clip attached yes. I did it to swap 2 Suburban bodies onto opposite frames. One was a round eye and the other was a mid 80's. At the time I was lucky to have access to the shop at work and used forklifts one on each side to lift them off and I set them down...
Just stumbled across this BAMF for sale. Wish I had the room or the use for it.
https://philadelphia.craigslist.org/grd/d/fort-washington-kubota-t1600-diesel/7734446947.html