You are certainly right on the mass. But some handling (e.g. turning a corner) its a moment of inertia effect I think. Height of the roof squared multiplied by the mass. So the roof is the worst place for any mass.
But as you say, perhaps tit makes no noiceable difference.

I'm told the sunroof adds about 20 kg to the roof (probably the worst place to add mass). Would that produce noticeable change in the handling I wonder ?

Thanks Nick,

I suppose the low profile spare is a lot narrower tyre, so fits front and rear fine in an emergency.

-chris

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