Per the specs, the Rad charger only puts out 1 amp. The pixel pro 8 wants 30 watts, so I think thats the problem.

From the USB charger Install Manual:
The USB Charger provides 1 amp of power. It can charge many, but not all, USB devices. Drawing more than 1 amp will turn the charger off.

I use the 5" stretch wrap form Home Depot. 1,000' for $12. I remove the battery and then wrap it around the entire battery housing (RC5+). I don't want to use one of those large covers because it would obstruct my vision out of the back of the car.

We bought the Hollywood Racks Destination E-bike rack. It was ~$700. We carry a Rad City step-thru and a high step. It works great! Mounts on our SUV easily. Folds up when not in use. I really like that if we have to get into the rear hatch of the SUV, the rack folds down with the bikes on the rack. We've traveled a couple thousand miles with bikes on the rack and its very stable. We remove the batteries and if it looks like rain, we'll cover the battery holder with 5" stretch wrap.

"don?t use the two screws bolting it to the frame" IF you don't use those 2 screws, what are you supposed to use..shorter screws?