GVs always seem to travel at max speed on the flat - but it should really depend on the terrain. Wheeled vehicles suffer far more than tracked vehicle over soft/bumpy ground. That's why roads were kinda strategic.
BTW - I love the new towns 
..and the Mossie XVI
they should try and get overspeeding tracked vehicles off roadways destroy the tracks. then the M18s top speed of 60 wont be 60 anymore...
