diff --git a/lib/redmine_qbo_vehicles.rb b/lib/redmine_qbo_vehicles.rb
index c41670c..69d0a1a 100644
--- a/lib/redmine_qbo_vehicles.rb
+++ b/lib/redmine_qbo_vehicles.rb
@@ -19,5 +19,13 @@ module RedmineQboVehicles
     Vehicles::Hooks::PdfHookListener
     Vehicles::Hooks::ViewHookListener
     Vehicles::Hooks::CustomerAppointmentShowHookListener
+
+    # If the SubtaskFieldCopier plugin is installed, register our fields
+    if defined?(SubtaskFieldCopier)
+      SubtaskFieldCopier.registered_fields << :vehicle
+      
+      # Ensure there are no duplicates in case of hot-reloads in development mode
+      SubtaskFieldCopier.registered_fields.uniq!
+    end
   end
 end
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