Smoke investigation calls should require a platform. It could be smoke investigation possibly where roof access is needed, yeah most engines carry a TIC on them but so do truck companies. It doesn't state if it's smoke from a building or smoke from a bonfire.
I know alot of people play real life with units but I operate all rescue engines, quints and pumper tankers. I call my Rescue/Engines a rescue or an engine and so on. Pumper tankers same thing I call engine 1(PT) easy as that