Sliding door

Hi all
Going to make a sliding door which will be 17 ft by 10ft was going to make it with 40mm box would this be strong enough or would I have to go to 50mm box.
 
Hi all
Going to make a sliding door which will be 17 ft by 10ft was going to make it with 40mm box would this be strong enough or would I have to go to 50mm box.
I went 50mm box for a 16’x16’ door here and it’s solid, a neighbour used 40mm and it bends with a strong gust of wind head on.
 
I made a similar sized door OP
I used 40x40x3 and 1mm galvanise sheeting. If you look up the pictures thread with my name on it they’re in there.

the key is having a proper door track. Door railing gets expensive quick when you start going up the sizes, which will be the case if you go 50x50. Just my 2 cents
 
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