Aloha Diesel Junkie,
Thanks and your opinion is appreciated! Yes, we used .120" walls. I'm assuming that the rack to roof is solid since Prospeed offers alot of attachments to their rack and it can hold about 550lb of weight. Their is some flex when I stand on the rack even before we started mounting all this gear. Time will tell I suppose. I'm going to leave the awning open again tonite and see how things are tomorrow morning.
A static load sitting overnight will likely never be your problem. If it sags in that condition, you have a serious issue. I highly doubt that will happen.
It will either happen when bouncing down the road and hitting a big bump,(Unlikely if the tent is folded up).
Most likely it will fail when the awning is deployed, and either a big gust of wind picks up, or someone trips and falls, and yanks on the awning.
A really good test for the stiffness of any structure is to check the natural frequency.
Basically the tip of the awning should be springy. Go ahead and give it a little yank and let go. It should spring back and oscillate. (you can also continue to tug on it at the natural frequency to keep it going).
have someone count the number of cycles in a given time period.(like 5 seconds)
If it is less than about 1-2 cycles per second(1-2 Hz) I would be worried. >5 Hz and you are golden. (just my estimate, and some of this will be the awning bar itself).
Another good test is to hit your bracket with a hammer, (without the awning on it) and listen to the tone. Higher pitch means the whole system is stiffer. Compare that tone to something you know is stiff, and something known flimsy.
Your bracket design is totally fine though... I just dont know about the rack or how its attached to the roof of your truck. Most OE rack mounts are designed to be more for appearance, than to actually hold anything.