[Finalgenesis]

Indeed, trample creates a lot of fatigue, as is berserk, both together will rack up fatigue even faster, probably past the point you want to try to fix it. The high fatigue means his high prot including berserk bonus becomes largely ineffective due to critical hits. As long as he's not in extended battle he can handle it, but I guess naked he can only take small amounts of pd, maybe a bit more with some gear.

But really, ethereal+luck behemoth/leviathan and maybe some extra speed (haste works with trample?) / iron warrior (behemoth) if you can swing it is probably better if you want a more solid trampling. Hell, just a couple ethereal elephants can probably outperform the cow.