diff --git a/Game/GigLine/Content/Hollywood/Vehicle/PA_Vehicle_Sedan.uasset b/Game/GigLine/Content/Hollywood/Vehicle/PA_Vehicle_Sedan.uasset
index 3187b08..6ac4b68 100644
--- a/Game/GigLine/Content/Hollywood/Vehicle/PA_Vehicle_Sedan.uasset
+++ b/Game/GigLine/Content/Hollywood/Vehicle/PA_Vehicle_Sedan.uasset
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:9369e54b7a0ec32d61be8fd4d27899f8a5ec85b895c120c094205fd00a568325
+oid sha256:6a59a116e5bbec41a67f643d785f0377a48c2aa1f4e8d0a3e2c55a4bf6515728
 size 2774
diff --git a/Game/GigLine/Content/Hollywood/Vehicle/SK_Vehicle_Sedan.uasset b/Game/GigLine/Content/Hollywood/Vehicle/SK_Vehicle_Sedan.uasset
index 30dc0b8..792d745 100644
--- a/Game/GigLine/Content/Hollywood/Vehicle/SK_Vehicle_Sedan.uasset
+++ b/Game/GigLine/Content/Hollywood/Vehicle/SK_Vehicle_Sedan.uasset
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:54bf640496c38ba9a740c8984e0b00fe602ef4987dd64b492177aaefec8db785
-size 254636
+oid sha256:bab3382656738c0ef807eef9d053340f71823cced744101987b07619816f0647
+size 32706361
diff --git a/Game/GigLine/Content/Hollywood/Vehicle/SK_Vehicle_Sedan_Skeleton.uasset b/Game/GigLine/Content/Hollywood/Vehicle/SK_Vehicle_Sedan_Skeleton.uasset
index 084a19c..8c9afe4 100644
--- a/Game/GigLine/Content/Hollywood/Vehicle/SK_Vehicle_Sedan_Skeleton.uasset
+++ b/Game/GigLine/Content/Hollywood/Vehicle/SK_Vehicle_Sedan_Skeleton.uasset
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:3fdd844087fdb0552ed99de2ab617a4b670cda0ba77d5bcea25413bc23312f0c
+oid sha256:7bde67380b5e495dbf7ceffd1408078fa5d7a75942d901bc94b39409b1ae67c6
 size 3064
diff --git a/Game/GigLine/Source/GigLine/GigLineVehicle.cpp b/Game/GigLine/Source/GigLine/GigLineVehicle.cpp
index 901dd64..4a85206 100644
--- a/Game/GigLine/Source/GigLine/GigLineVehicle.cpp
+++ b/Game/GigLine/Source/GigLine/GigLineVehicle.cpp
@@ -445,19 +445,22 @@ void AGigLineVehicle::Tick(float DeltaSeconds)
 	// If the Chaos vehicle never came into existence (no wheels), its movement component has no
 	// valid state to drive, and continuing to tick it writes whatever is in that empty state back
 	// onto the actor - which is the only explanation that fits a still body and a moving actor.
+	// Only stop in that case: with real wheels the mover must keep ticking to drive, and stopping
+	// it at 2.5 s was what killed the drive test (throttle runs 1-4 s).
 	if (!bMoverStopped && SettleElapsed > 2.5f)
 	{
-		bMoverStopped = true;
-		if (const UChaosWheeledVehicleMovementComponent* WheelComp =
-				Cast<UChaosWheeledVehicleMovementComponent>(GetVehicleMovementComponent()))
+		const UChaosWheeledVehicleMovementComponent* WheelComp =
+			Cast<UChaosWheeledVehicleMovementComponent>(GetVehicleMovementComponent());
+		if (!WheelComp || WheelComp->Wheels.Num() == 0)
 		{
+			bMoverStopped = true;
 			UE_LOG(LogTemp, Warning,
 				TEXT("GigLine vehicle: stopping the mover - wheels=%d at Z %.0f"),
-				WheelComp->Wheels.Num(), GetActorLocation().Z);
-		}
-		if (UMovementComponent* Mover = GetVehicleMovementComponent())
-		{
-			Mover->SetComponentTickEnabled(false);
+				WheelComp ? WheelComp->Wheels.Num() : -1, GetActorLocation().Z);
+			if (UMovementComponent* Mover = GetVehicleMovementComponent())
+			{
+				Mover->SetComponentTickEnabled(false);
+			}
 		}
 	}
 
diff --git a/Game/GigLine/Source/GigLine/GigLineVehicleBuilder.cpp b/Game/GigLine/Source/GigLine/GigLineVehicleBuilder.cpp
index 74a7c59..0d839a6 100644
--- a/Game/GigLine/Source/GigLine/GigLineVehicleBuilder.cpp
+++ b/Game/GigLine/Source/GigLine/GigLineVehicleBuilder.cpp
@@ -53,14 +53,17 @@ UPhysicsAsset* UGigLineVehicleBuilder::BuildPhysicsAsset(USkeletalMesh* Mesh,
 	// A box slightly under the mesh bounds: a body that is exactly the bounds sits on the
 	// ground plane and reads as floating because the mesh has wheels below the sills.
 	FKBoxElem Box;
+	// The skeletal mesh imports ROLLED (height along Y, width along Z) while the armature is
+	// unrolled (height Z, width Y). The box is a body on the root bone, so it must be built in
+	// the UNROLLED frame: length from mesh X, width from mesh Z, height from mesh Y.
 	Box.X = Extent.X * 1.9f;
-	Box.Y = Extent.Y * 1.8f;
-	Box.Z = Extent.Z * 0.55f;
-	// The chassis body must sit ABOVE the ground (the car body is at Z 0..height), not below
-	// the root bone. The old -Extent.Z*0.25 put the box below the ground and the suspension
-	// (measured against the root bone) then pushed the chassis upward. Place it at the car's
-	// mid-height instead.
-	Box.Center = FVector(0.f, 0.f, Extent.Z * 0.35f);
+	Box.Y = Extent.Z * 1.8f;
+	Box.Z = Extent.Y * 0.55f;
+	// The chassis sits at the car's centre of mass, which is the rolled mesh's mid-height
+	// (Bounds.Origin.Y) mapped onto the unrolled height axis (Z). The suspension rest position is
+	// measured against the root bone (the grounded origin), so the box must sit at the centre of
+	// mass rather than the root bone - this is what settled the vehicle on the road.
+	Box.Center = FVector(0.f, 0.f, Bounds.Origin.Y);
 	Body->AggGeom.BoxElems.Add(Box);
 	PhysicsAsset->SkeletalBodySetups.Add(Body);