Maximum thrust for Hwasong-19 previously stated was 140 ton force and now they declare it is being upgraded to 200 ton force.Good choice, carbon fiber, means light = more range. Also im curious on their energetic material (yes propellant) industries. Seems to be flourishing seeing those missiles.
Hwasong-20 will probably be same length as 19 yet 2nd and 3rd stage will have same diameter as 1st stage unlike 19 for example.
At this point throw weight to eastern coast of mainland/continental USA is probably 3 tons and enough for cluster of 4 to 6 MIRV's.