Asked
— Edited
I was able to prevent slippage in the rubber tracks by using outdoor electrical insulation tape. It is much thicker than the black electrical tape.
Apply this tape by peeling off the backing and stretching it around the wheel hub. Overlap the ends by about an inch.
Pick it up at your local hardware store.
Alan
Well, now that it is out of warranty, I suppose that might be worth a try. The injection molded plastic is pretty slippery.
Alan