[Boatanchors] Questions re rack mounting

[bc at councilman.com]

I would appreciate your input about how to get my vintage gear into a rack.  My first experience.

Picked up a vintage two post 6' rack on steel base with casters.  Posts are offset from the center and supported by large triangular brackets.

>From top to bottom:

270G-3  (are brackets are available?)
75A-4
20-A, 458 and MM-2
100V
600L  on wood riser directly on the base plate (and may I never have to lift it higher)

Given my tight space situation, I would prefer to use cantilevered shelves.  Potential problems?

Is it OK ground everything to the rack?

The coax run from the 600L to the antenna tuner will be about 10'.  Potential issues?   (AT2KD  > 18" coax  >  4:1 balun > 600 ohm ladder line)

I'm shopping for larger casters as I expect it will weigh at least 300 lbs.

What am I missing?

Thanks,

--Brad  W1BCC