Sun / Rain shade

Shelly

Tab 320-S 2018 I was thinking -
what do you think ? 

To block sun and rain off my Tab 
if I have a long tarp - tie it to right stabilizers wrap it up over the top toward the left -see arrow 
then pull it out 10-12 ish feet I stabilize with poles or to the camp ground pergola 
I have a cover and canopy ! 

Any suggestions???
of course could not use the roof vent.