The Mugen is too new to find much specific to it, but there are a few truggy conversions around here.
You can do it like mine if you like... thread here....
http://www.rc-monster.com/forum/show...=jammin+truggy
Other threads of interest...
http://www.rc-monster.com/forum/show...=jammin+truggy
http://www.rc-monster.com/forum/show...=jammin+truggy
Just search truggy or jammin etc