I meant I tried it, but it didn't work, so I'm assuming that it's the per-player one instead of the global one.
I also guessed cause when I tried to spawn another vehicle, it said "You already have 5 physics vehicles"
But idk the command for it.
I'm assuming it's
$Pref::Server::PlayerPhysVehicles_Total = "20";
or
$Pref::Server::PerPlayerPhysVehicles_Total = "20";