While it's a little bit of a powder keg whenever this comes up. Where I'm from we play that vehicles benefit from Inv saves (as so many vehicle have, or have direct access to one). That said, yes to the land raider getting the 4++, Also yes the field emanates 3" from the hull of the land raider which is pretty boss if you are escorting other raiders or if IG allied Russes are rolling up with you.
We always joke that whenever anything like this occurs that the character in question plugs the whatsit in to the reactor for a significant power boost, helps to suspend the disbelief,
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