diff --git a/src/client/stores/CalculationStore/Effects/reactions/otherReactions.ts b/src/client/stores/CalculationStore/Effects/reactions/otherReactions.ts
index b6538a8..5e1d7d9 100644
--- a/src/client/stores/CalculationStore/Effects/reactions/otherReactions.ts
+++ b/src/client/stores/CalculationStore/Effects/reactions/otherReactions.ts
@@ -1445,6 +1445,17 @@ const reactionEffects: IReactionEffect[] = [
       calculationStore.setValue('rate', rates[0].evo_id);
     },
   }),
+
+  calculationStore => ({
+    expression: () => calculationStore.getOption('selectLeaseObjectType'),
+    effect: leaseObjectType => {
+      if (leaseObjectType.evo_id === '7') {
+        calculationStore.setValue('withTrailer', true);
+      } else {
+        calculationStore.setValue('withTrailer', false);
+      }
+    },
+  }),
 ];
 
 export default reactionEffects;