So you camp, or is it RV?
If you don't boondock, then replacing the cloth awning with sun shade cloth will help.
Using high pressure misters under the awning will to.
If you actually move your rig the roof shade may be more work than what it's worth.
Mounting solar panels above the A/C units over the entire rooftop would offer a solution.
Shade is more effective than insulation ever will be.
More AC??? Look, you're driving a stinking greenhouse down the road. Where it's not glass,the "insulation" is a semi-solid,, and at Best 2" thick.
Over the last two years I have listened to a bunch of people complaining about unreliable electric issues in parks across the country. It's not the parks, it's the grid! Brown outs are common, and more equipment is only going to make things worse. Deal with it the smart way.