But mechs can solve any problem! Hero can't get it up? Show him a mech, instant boner.
Hero needs to survive a week in highschool? Just run over the school until it's flat!
Little girl needs to drive heavy machinery? I was expecting her to get pelted with Japanese food for awhile until she absorbed superior nihon steel class knowledge
But to be more serious, I'm pretty sure that making heavy machinery bear proof isn't commonly done, I've already forgotten if these vehicles are from Japan or from a cave.