Yes Smerch is deadliest in the world... and has 90km range with guidance.
Look One truck carriers 12 missiles in one batalion you have 8 truck witch means
96 missiles. Each missile warhead waights 243 kg whitch means only one
batalion in one salvo fires 23328 kg TNT and with its reload time of 20min (+ few
more for Salvo time/Tme to prepare for action/Time for urgent leaving of the
firing position after launch witch takes about 5min). That basicly means one
batalion of Smerch units in one hour (three reload) can fire massivly 70 000
kg TNT on oponent at 90km distance accuratly.
Besides vehicle carrieng missiles is fast and can go throw rought terain.
http://www.splav.org/en/arms/smerch/index.asp