Yep, the length of the blinks suggests you're losing power for a significant period of time. The copper strips are available, but the issue will be where do you screw them down on the truck. For trucks designed to use them, there are convenient screw holes.
You may have to resort to my fix and clean the paint from the contact points and under the screws.
FWIW, I think this may not be the wheels, but rather the rollers and switch spacing. A little time with a meter will lead you to the cause.
