All have fuel jets with 3x as much as the standard fuel jet player, assuming it was 100 to begin with.
Light has 375 HP and 3 weapon slots. Is a bit faster than medium.
Medium has 4 weapon slots and 600HP.
Heavy has 5 slots and 1000 HP, but is slow as HELL (Standard player speed with "walk" active)
Obviously these values don't match twibes 2, but it's close enough.