I think you mean the long rod with the bent-over tip that you use to grab the loop to pull the awning down (and open it?) If so, I store mine in the back bumper, But others may put theirs anywhere.
I suppose these things can be bought if you can't find yours, but you could certainly make one out of a steel rod.
Hi-Lo 1707T - Tire Minder TPMS on Tow Vehicle and Trailer, 300W Solar Battery Charger, Equal-i-zer WDH
2014 F150 Platinum 4x4 3.5L EcoBoost SCrew