TOCA 3 has monster trucks, physics are probably better thank monster truck madness
Ahh, I use to love Monster Truck Madness.
Yeah, that was a load of fun, too bad it had like 2 tracks for monster trucks.
4x4 Evolution and 4x4 EVO 2 are like spiritual successors to MTM (all are developed by Terminal Reality). And they are released as freeware now! Last time I played (over a year ago) there were people still playing online. Even the Dreamcast version can go online and play with PC people.
http://vales.com/evo1/freeEvo1.asp
http://vales.com/evo2/freeEvo2.asp