Steambot Chronicles 2 (Bumpy Trot 2)
I think Steambot Chroincles is a really fun flawed gem on the PS2, with a lot of sandbox-feeling (Choice and Consequence) for the pseudo Action-RPG is wanted to be.
The thing that stops me from calling it a good game and recomending it is... well everything involving the actual Steambot itself - which used ACTUAL tank controls, and a game could lag painfully whenenver expositon effects, including basic range weapons, were used (didn't help that the setpiece big army fight took place in a sandstorm).
There was a PSP sequel/sidegame called Steambot Chronicles:Battle Tournament (which had better combat, but stripped down the non-combat part of the game) but any of hope of the sequel coming out ended with the total dismantling of Irem's video game division.