Need to unscrew it.
Doing an ETD on the coalporters is the biggest pain in the neck.
Rotate the truck and you'll see the 2 screws you need to unscrew to remove the slope sheet. Then unscrew the truck.
Before you install the ETD truck, put the screws back in the holes. The rest of it, I'd suggest working upside down. Put the truck on and screw it down, then put the slope sheet back in and then wiggle the screw driver in, any way possible and tighten the slope sheet screws.