i've heard of people being successful with the truck on a track after some tunning, but i don't know of any convesions. i have both a gs buggy and truggy roller at the house, although i just hacked the truggy chassie for some aluminum. i think if you search there is a extended pro chassie out there. there is also a long arm kit, tomohawk i think or something like that. i wouldn't give up on it though i'm sure it can be a decent truck.
heres some parts
http://www.amainhobbies.com/index.php/cPath/1_24_194