The SS-27 is road mobile. Probably more so then the Messengers considering it's top speed of 45km/h compared to the shuttle crawler's 1.6km/h.
You clearly need to look up MIRVs; they are flashy as hell.
This is a test, no warheads, from a Peacekeeper missile:
Now imagine one of these:
going off at the terminus of each of those rays of light. Well
technically that was 500kt, closest I could find, but a 350kt would be about the same.
Oh and for a fictional example of how cool MIRVs can be:
although admittedly those are crazy big explosions, >10 gigaton, but I think my point on coolness is made.
Already mentioned that:
You'd want a
few nukes for that but the
vast majority would be smaller ones.