As always, thanks for sharing Arth.
I believe you're right, 35% will be difficult to detect.. especially since the HP I spoke with said a suspicion of illegal tint is a secondary stop (I assume this means they have to pull me over for something else and then look at the tint..?).
As for the 18% your current Ram has.. even if I could by law have any tint %, I would still not go that dark. I prefer to be able to see out at night and the factory % in the rear is just about as dark as I'd care to go.