The National Guards of Saudi Arabia does not use rocket launchers ,but they have anti-tanks weapons.
The MLRS only used by air defense forces & land forces .
Also, it's totally separated from land forces ,because the mission of the national guard is to defend the country from inside,but they're well trained so they can support the land forces if there is need.
Here are some pics for the Tow launchers ( The National Guards of Saudi Arabia have about 16,000 tow missiles) :
Also, the African missile "INGWE" it's loaded on the armored vehicle Shible-2
I have no much information about the National Guards anti-tank missiles ,but waht I know is KSA have tow,Kornet E,Javelin and the russian Konkurs .