Mayantribe just sent me this pic of his custom Rampage XB set-up for on road running.  Maybe he'll comment and let us know exactly what he's done for mods but I see:
-7075rc HPI Baja wheel adapters
-GRP wheels
-Hitec Servos
-Misc. Alloy Hop-Ups
-Zenoah 270

I think it looks pretty sweet, what do you guys think?