is not over-kill if you use little'r pieces!
I do not run VHB tape on every available surface, only where needed to hold it, and removal is certain one day so I try to make it easy on future self.
I use 700-1,500 degree heat gun to remove it with with great difficulty, so 170 degrees should still be fine.
Aluminum, esp RV roofs, is still susceptible to "rotting". Putting the flex panel directly on the roof will eternally trap water which can galvanize or something the aluminum, I say can, not will. When the water is gone the roof will get very hot, and for fiberglass roofs I know it will discolor it, but I havent personally done this on aluminum. Think how you can put some currogated plastic under the panels so air can get under via the plastic flutes. You can do this with EternaBond tape and I have done that on fiberglass roof so there is 100% airflow under, though not a lot of it, but air will never be trapped, nor will water be trapped under a hot panel against a roof.
Do flex panels when needed, for weight or for their low profile, use glass otherwise. IDK how you will remove the VHB tape under a flex panel, you will destroy the panel possibly, but screwing a glass panel to an aluminum frame, then removing the aluminum frame's VHB tape with heat gun after is a lot easier.
Use quality flex panels, not the low cost ones which fail quicker
