Important - check this every time you set up

Assuming the layer of aluminum exists a direct strike might get diverted to ground.  Lightning does really weird things so there is no guarantee, even in a steel + concrete building, and even if it strikes something outside and well away from a building.  It struck a large transformer at our church and shot out of an outlet and across a room in a building 200 feet away, even though the transformer was sitting on the ground and was properly grounded, just one example.

 

That said, do I move my family into our TV at the first signs of lighning?  No.  I didn't do it when we had a popup with nothing but tenting and a wood-framed roof above us.  I've pulled up all the stats before and you have a much, much, much larger chance of being murdered in any given year than being struck by (let alone killed by) lightning.  The average is about 50 deaths per year, and about 300 injuries.  For all 19 deaths this year the people involved were out in the open.  I would worry much more about a falling limb or tree during a storm.

 

I'll also emphasize here the need to follow the 30/30 rule.  Lightning really will strike "from a clear blue sky" from a distant storm.  I've experienced it personally, which I detailed here a few years ago:  http://www.rpod-owners.com/forum_posts.asp?TID=1974