Can the armour from the trailers reach the cap? (studded armour, iron helmet, iron gauntlets, iron boots)

Possibly with max heavy armour, light armour, smithing and enchanting skills?

Is it important? You can just play on novice and avoid all that grinding.

You can. Maybe just with Alchemy alone.

Or, just use the schools you listed.

Legendary smith them,that will be enough...plus perks...you don't need to hit the armor cap to survive.