Do yall know if the tint that is already in the windows for rear seats and tailgate is heat resistant and UVA and UVB protected. I was wondering if it's redundant to have tints put on them already for that purpose and also since the front 2 windows don't come with tints.

 

Yes, the rear windows and rear wind shield already have tint on them. Light color, but works.
I would just get the front 2 tinted, unless you want much darker color.