It seems like it’s basically the end of towed weapons systems like artillery right? I did find this reddit post about the same for the US military: https://www.reddit.com/r/Military/comments/1bv7ah6/the_end_of_an_era_us_army_signals_shift_away_from/
It always seemed like towing a weapon would be a huge time-sink. Someone in the comments mentioned that the US military is designed for imperialism (my word) so they need stuff that is lighter-weight to transport on aircraft. So I guess with Chinese systems being actually designed for defense and not having to move them on airplanes, having them on vehicles makes sense.
I was thinking about whether they made the trucks just to show off in the parade, but if they were just showing off, surely they wouldn’t bother integrating all the guts of the system and could just put the emitter head on a smaller vehicle. The sheer size of the trucks carrying them implies to me that the whole functional system is in there.