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I don't see this mentioned in the book but it is with the normal gun description. Is the twin plasma gun supercharged going to kill the whole transport if a one is rolled?

if it didn't make an exception to the normal overcarge rules then yes it will kill the transport

I hope this gets addressed in the codexes as it kills the lasplas loadout on razorbacks. I think the rule was meant for a model, not an 10hp transport but I guess we will see what they do.

There's other vehicle that can die to an supercharged plasma weapon (e.g., the Rhino Primaris, Land Raider Excelsior, Armored Sentinels).

Maybe...
The Super Hot Plasma flooded the Crew Compartment

 Ministry wrote:
I hope this gets addressed in the codexes as it kills the lasplas loadout on razorbacks. I think the rule was meant for a model, not an 10hp transport but I guess we will see what they do.

You're not forced to supercharge the plasma guns.

In the german Index Imperium 1 the Twin Plasmagun kills the Vehicle on a 1, when supercharged.