Maybe the underground great tunnel networks aren't big or wide enough for the bigger missiles and TELs?
Closely clustered silos are actually very difficult to destroy. The really hardened ones require direct hit by megaton yield warhead to destroy and the next silo a few hundred meter away would still not be damaged enough to prevent a launch. Space them right and you can't even destroy two of them by landing a warhead between them. You also can't hit a whole group of closely clustered silos with MIRV because the silos are much harder than warheads themselves and landing warheads that close to each other would mean some of them are destroyed by the explosion of others before they can explode. You actually have to hit them with missiles one after the other and by then it's pointless.
For context, the Iranians gave American forces and Iraqis ample warning (nearly 8 hours to be precise) to evacuate before the ballistic missiles hit the air base.
That is not true I remember seeing TEL inside silo it is big enough all right. The TEL cabin is designed for 2 compartment allowing the rocket head to sit between them so it is low profile. What do you mean by shifting to other region because The UGW is all over China it is not limited to specific region or mountain. It is mostly in central Chinese mountainous area but some of them in the north, west, east and south all over the country. I think the silo complement those UGW basing as they allow speedier deployment specially if it solid rocket like DF 41 and can be launched on warning.
