[Marcello]

I got the feeling that in a high intensity war fought with modern counterbattery techniques unless you are really good at jamming/neutralizing enemy Firefinder type radars towed guns will be able to spend only very limited amount of time firing. Such truck mounted guns, by cutting the amount of time needed for attaching them to the prime mover can mitigate the problem without being as expensive as a standard SPA. In lower intensity situations they are still cheaper to run than a tracked SPA.