well then from what u said the tmaxx would do great in our back yard considering that the yard is so rough its like an washboard, with bumps and potholes everywhere. i would say the volcano might just bottom out on an bump. i think i might have to just try this spring to acutally till up some room to smooth out and make an track with an few dips and jumps since our back yard was an hayfield, it should be easy enough to make an good track, might take an while but it would be worth it.