Great question! I too have run into this. would the shoota boyz with weapon strengh 4 be considered defensive weapons? If so, then a fast, open-topped vehicle such as a trukk could move 12" with all the boyz still able to fire. Is this correct?
No, embarked units do not count towards the vehicles defensive weapons,
page 58 in the BRB under DEFENSIVE WEAPONS. Any
vehicles weapons of strength 4 or less are considered defensive. Embarked units are not a vehicles weapons.
Embarked troop in an O.T.V. (open topped vehicle) can all fire if the vehicle moves less then cruising speed.
Page 66 in the BRB. Embarked troops are considered to have moved if the vehicle moved, so heavy weapons will not be able to fire, unless they have the relentless USR.
The special rules for O.T.V.'s are on
page 70 in the BRB. Other then those extra rules, O.T.V.'s follow all the same rules for the type of vehicle it is, (i.e. tank, skimmer, fast vehicle, etc.)
Where does it say anything about distance moved and shooting with passengers?
Page 66 in the BRB under
FIRE POINTS.
basically an open topped vehicle has the following pro's and cons':
Pro's:
-Embark/disembark anywhere within 2 inches of the vehicle, no access points.
-All embarked troops can fire from the vehicle as long as all rules for moving and shooting are followed, (such as heavy weapons or moving at cruising speed or faster.)
-Embarked units can assault after disembarking even if the vehicle moved that turn.
-The strength of hits inflicted due to an exploding open topped vehicle are reduced by -1 to any embarked units.
Con's:
-Add +1 to all damage results against open topped vehicles on the vehicle damage chart.