diff --git a/src/chrono_swig/interface/irrlicht/ChModuleIrrlicht.i b/src/chrono_swig/interface/irrlicht/ChModuleIrrlicht.i
index 8833bbca11..c6bb05840f 100644
--- a/src/chrono_swig/interface/irrlicht/ChModuleIrrlicht.i
+++ b/src/chrono_swig/interface/irrlicht/ChModuleIrrlicht.i
@@ -132,6 +132,7 @@ using namespace gui;
 %import(module="pychrono.core") "chrono_swig/interface/core/ChFrame.i"
 // %import(module="pychrono.core") "../../../chrono/functions/ChFunction.h"
 // %import(module="pychrono.core") "chrono_swig/interface/core/ChFunction.i"
+%import(module="pychrono.core") "chrono_swig/interface/core/ChObject.i" // ChObject should be imported before ChPhysicsItem
 %import(module="pychrono.core") "chrono_swig/interface/core/ChPhysicsItem.i"
 %import(module="pychrono.core") "chrono_swig/interface/core/ChVisualMaterial.i"
 %import(module="pychrono.core") "chrono_swig/interface/core/ChVisualShape.i"
diff --git a/src/chrono_swig/interface/irrlicht/ChVisualSystemIrrlicht.i b/src/chrono_swig/interface/irrlicht/ChVisualSystemIrrlicht.i
index 8493820cf4..a46d4937dc 100644
--- a/src/chrono_swig/interface/irrlicht/ChVisualSystemIrrlicht.i
+++ b/src/chrono_swig/interface/irrlicht/ChVisualSystemIrrlicht.i
@@ -9,8 +9,6 @@
 ////#endif // --------------------------------------------------------------------- CSHARP
 
 %{
-#include "chrono/assets/ChVisualSystem.h"
-
 #include "chrono_irrlicht/ChIrrNodeShape.h"
 #include "chrono_irrlicht/ChIrrNodeModel.h"
 #include "chrono_irrlicht/ChVisualSystemIrrlicht.h"
diff --git a/src/chrono_swig/interface/vehicle/ChModuleVehicle.i b/src/chrono_swig/interface/vehicle/ChModuleVehicle.i
index 38e31ddc64..203bd819dd 100644
--- a/src/chrono_swig/interface/vehicle/ChModuleVehicle.i
+++ b/src/chrono_swig/interface/vehicle/ChModuleVehicle.i
@@ -119,8 +119,6 @@
 
 #include "chrono_vehicle/tracked_vehicle/ChTrackContactManager.h"
 
-#include "chrono_vehicle/ChVehicleVisualSystem.h"
-
 // Vehicle models
 #include "chrono_models/ChApiModels.h"
 #include "chrono_models/vehicle/ChVehicleModelDefs.h"
@@ -425,6 +423,14 @@ Before adding a shared_ptr, mark as shared ptr all its inheritance tree in the m
 
 %include "vehicleUtils.i"
 
+#ifdef SWIGCSHARP  // --------------------------------------------------------------------- CSHARP
+// Import ChVisualSystem base class unconditionally (ChVehicleVisualSystem inherits from it)
+// Python gets this via module imports from pychrono.irrlicht or pychrono.vsg3d into appropriate module
+// but C# Unity with no visualisation module but with this vehicle module needs an unconditional
+// for SWIG to understand the inheritance
+%import "chrono_swig/interface/core/ChVisualSystem.i"
+#endif             // --------------------------------------------------------------------- CSHARP
+
 %include "../../../chrono_vehicle/ChVehicleVisualSystem.h" 
 
 #ifdef CHRONO_IRRLICHT
diff --git a/src/chrono_swig/interface/vehicle/ChVehicleVisualSystemIrrlicht.i b/src/chrono_swig/interface/vehicle/ChVehicleVisualSystemIrrlicht.i
index 20c460afb7..76d457b1db 100644
--- a/src/chrono_swig/interface/vehicle/ChVehicleVisualSystemIrrlicht.i
+++ b/src/chrono_swig/interface/vehicle/ChVehicleVisualSystemIrrlicht.i
@@ -57,9 +57,8 @@ using namespace irr::scene; // This is inserted for the extend functions that us
     // Extending the missing functions is a workaround
     //
 
-    // Visual Systems, in SWIG order, 1- ChVehicleVisualSystem, 2- ChVisualSystemIrrlicht, 3 - ChVehicleVisualSystemIrrlicht
+    // Visual Systems, in SWIG order, 1- ChVehicleVisualSystem (in base ChModuleVehicle.i), 2- ChVisualSystemIrrlicht, 3- ChVehicleVisualSystemIrrlicht
     // Ensure both base classes are fully defined before the derived MI class to avoid incomplete base warnings in C#.
-    %include "../../../chrono_vehicle/ChVehicleVisualSystem.h"
     %include "../../../chrono_irrlicht/ChVisualSystemIrrlicht.h"
     %include "../../../chrono_vehicle/visualization/ChVehicleVisualSystemIrrlicht.h"
 
diff --git a/src/chrono_swig/interface/vsg/ChModuleVsg.i b/src/chrono_swig/interface/vsg/ChModuleVsg.i
index fcfff791e4..ddf089ccd1 100644
--- a/src/chrono_swig/interface/vsg/ChModuleVsg.i
+++ b/src/chrono_swig/interface/vsg/ChModuleVsg.i
@@ -75,6 +75,7 @@ using namespace chrono::vsg3d;
 %import(module="pychrono.core") "chrono_swig/interface/core/ChFrame.i"
 // %import(module="pychrono.core") "../../../chrono/functions/ChFunction.h"
 // %import(module="pychrono.core") "chrono_swig/interface/core/ChFunction.i"
+%import(module="pychrono.core") "chrono_swig/interface/core/ChObject.i" // ChObject import before ChPhysicsItem
 %import(module="pychrono.core") "chrono_swig/interface/core/ChPhysicsItem.i"
 %import(module="pychrono.core") "chrono_swig/interface/core/ChVisualMaterial.i"
 %import(module="pychrono.core") "chrono_swig/interface/core/ChVisualShape.i"
diff --git a/src/chrono_swig/interface/vsg/ChVisualSystemVSG.i b/src/chrono_swig/interface/vsg/ChVisualSystemVSG.i
index 41b3719b86..2aba63efa0 100644
--- a/src/chrono_swig/interface/vsg/ChVisualSystemVSG.i
+++ b/src/chrono_swig/interface/vsg/ChVisualSystemVSG.i
@@ -12,6 +12,9 @@ using namespace chrono::vsg3d;
 %shared_ptr(chrono::vsg3d::ChVisualSystemVSG)
 %shared_ptr(chrono::vsg3d::ChVisualSystemVSGPlugin)
 
+// Import base class ChVisualSystem (same pattern as in ChVisualSystemIrrlicht.i)
+%import(module="pychrono.core") "chrono_swig/interface/core/ChVisualSystem.i"
+
 /* Parse the header file to generate wrappers */
 %include "../../../chrono_vsg/ChVisualSystemVSG.h"