Devastators?

[spaceman91]

"the razorback has 3 so 4 heavy weapons is a waste of points."

a Razorback has no fire points.

edit:
the gun replaces the hatch so no one can shoot out of the top.

[deed116]

Behind an aegis defence line, sarge mans the quad gun. Plasma cannons ruin anything caught out in the open.

[Liazardman]

"the razorback has 3 so 4 heavy weapons is a waste of points."

a Razorback has no fire points.

edit:
the gun replaces the hatch so no one can shoot out of the top.

True enough I must have been thinking of a rhino with havoc launcher ....

I guess then my advice is such - If your giving them a transport use it to block LoS to them when needed, if your not then give them enoguh range and pay special attention to any anti-infantry threats while no other reall targets present themselves, people will fire gun x at them just because they have nthing better to shoot at