My next cart thinking has to do with the above title.
Saw a magnificent upright custom case cart here (will get and post an image of it in due course) here with a hinge top that I imagined might work design-wise to:
Lid monitor storage
Sides
Protect the top shelf
Light rain and sun protection
Will hold a tarp from monitors and mix surface
It will have to be custom, but absolutely doable.
Then a sliding shelf to be made out of/on top of extant static mixer shelf so I may draw the mixer back over my knees some.
Also custom work, but...I think these things will make the cart perfect and I can quit tweaking for quite some time.
Snort.
Jan