I can't help with the sunroof, however,... white smoke out the tailpipe is never good. Most of the time when smoke comes out the tailpipe its either black or blueish. Black smoke is fine for the most part, blueish smoke is oil burning, white smoke usually means that coolants is getting into the combustion chamber... (so the block could have a small crack, head gasket could have a rip in it)
I would chage your oil and look for coolant that has mixed in but not burned off yet. The coolant and the oil will not mix so it should be pretty easy to see it. And you can have the oil tested to see if it in there as well.
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-John
Some of my favorite quotes:
"what you do in life, echo's in eternity..."
"death smiles at us all... all a man can do is smile back..."
1999 Discovery II SE-7 
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