If you can get a T-Maxx and Savage to wheelie (which isn't hard), then you can get an MT2 to do it too. Last summer at a race in the monster truck class I saw a Cen MT2 and it did wheelies like nuts, driver told me he used 70wt shock oil and a Sirio .18 and pretty much everything else was stock (though I think he changed clutchbell gearing) and he finished 2nd behind a .21 converted T-Maxx.

I don't really bother but my Nitro MT with .15 CV can almost do wheelies, so you can just stiffen the suspension and lower the gearing and have a slightly more powerful motor (a Megatech .16 should be plenty).