WTF would they need a mobile firing range? Sounds like a lawsuit waiting to happen or maybe somebody’s cousin sells mobile firing ranges.
The stated reason....”to lessen quality-of-life disturbances.” Seems like a fixed site could be soundproofed easily enough.
Mobile firing range.
I have shot in them.
As a police training instructor for several decades. I found them cramped and of limited training value.
That is of course unless one has no place else to shoot.