I saw a vehicle with Mattracks (www.mattracks.com There are a bunch of videos on the site) and I immediately thought how great a PT425 would be with a set. They make them for big pickups all the way down to ATV's (www.litefootatv.com). Although a bit pricy I just couldn't help but imagine an articulated PT so equipped would be almost unstoppable and would have so little ground pressure you wouldn't even dent a lawn. I also doubt you would be able to tip it over. The correct ground clearance and drive ratios would have to be figured out....OK I'm dreaming but wow it would be cool.