When racing on blue groove tracks I have the same thought about how fun it would be to run a on road Mugen/Serpent on some of these tracks. You nailed it when you were talking about the belts and lack of suspention travel. Cleaning a 8th scale in off road guies would be a nightmare. I would not do it to mine.
There are many 1/8 scale on road buggy based cars out there. There is the rally class out there. Some have 2speeds (Inferno GT & Ofna GTPII). They fly and have the suspention to take up the jumps and bumps. They are alos built like tanks. You have to try to break something in order to be sidelined.
Me, I own a nest of Serpents. I would not convert my snakes to off road. Thats why I have my Jammins!
Herolin <---Traded my Airtronics for an Ipad and Laptop...
Soon to be GHETTOPRINCIPAL..