This is covered all over and hoping I have everything correct. Im planning on doing a sub panel in a detached garage, from panel to panel is 210ft. My plan is to bury 2" PVC 18" deep (from top of PVC), run three 2/0 Alum xhhw-2 feeders for hot-hot-neutral, one 4AWG alum xhhw-2 ground, to the unbounded 30 space 200amp (rated) sub panel. Upstream breaker will be 125amp, down stream will leave the 200 (just a disconnect really). Adding 2 ground rods to earth ground the panel 8ft apart.
Permit and inspection will happen but just making sure I'm on track.
Let me know if this sounds on track or if anything isn't to code.