Iran builds a 6 launcher battlefield rocket disguised as a white civilian truck at a fraction of the cost, but HIMARS is some super weapon never seen before.
While you have to hide a HIMARS under bridges, vegetation, or other forms of concealment, constantly! You can literally part this truck in the side of a road or a parking lot in plain-view right in front of recon, and satellites and it will avoid targeting and destruction.
In terms of pure practicality, this Fath launcher is better. Most countries have 100,000s or millions of trucks in circulation, if a country wishes to targeted every truck in existence in a country, it simply can't wage war.
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