Traxxas

Supermaxx
https://www.unlimitedengineering.com/ext_susp.shtml

https://traxxas.com/products

https://www.youtube.com/watch?v=OzPWCsbStA0#t=17

http://www.ebay.com/usr/billytrucks123?_trksid=p2047675.l2559 Parts sold by billytrucks123

links
Tracked_vehicle robotshop.com tank tracks.