insulation

Hi all - first post, first time truck owner. Love my new truck but maybe a weird question and not sure where to post. My engine compartment has what looks like insulation or sound dampening material, but it’s only on the driver side. Should it also be on the passenger side of the engine well...

I was planning to insulate the cab of my 2019 RAM Limited. Would like to add a first layer of sound deadener, a second layer isolator and a third layer of sound absorber of silent coat. But I don't know if I should go for a full three layer insulation. Does someone know if the Limited has...