I successfully rooted with KingRoot and tried to manually switch to SuperSU with a script I found.
The script seemed workable. I found all of the targets and: # root.sh ... oh *hi*
The transition failed and after trying to 'clean up' remnants the script seemed to have missed, the screen froze: RESET BUTTON - nothing, nothing, nothing.
I wish I hadn't believed it would work without a 'dd ... system.img'. The tablet had about 12hrs mileage and is now a very new [Black Friday] $49 item about to be smashed on the driveway.
I read somewhere that RCA will not be distributing winusb drivers.
*uc* it - i b-roke i-t!
It's Alive! After the battery drained, 2 weeks later, it booted!