diff --git a/vsd_fleet_ms/hooks.py b/vsd_fleet_ms/hooks.py
index a27f2e8..84929f9 100644
--- a/vsd_fleet_ms/hooks.py
+++ b/vsd_fleet_ms/hooks.py
@@ -142,6 +142,11 @@
 #		"vsd_fleet_ms.tasks.monthly"
 #	],
 # }
+scheduler_events = {
+	"daily": [
+		"vsd_fleet_ms.utils.document_expiry.notify_expiring_documents",
+	],
+}
 
 # Testing
 # -------
diff --git a/vsd_fleet_ms/utils/document_expiry.py b/vsd_fleet_ms/utils/document_expiry.py
new file mode 100644
index 0000000..8d13c06
--- /dev/null
+++ b/vsd_fleet_ms/utils/document_expiry.py
@@ -0,0 +1,110 @@
+import frappe
+from frappe.utils import getdate, nowdate
+
+
+DEFAULT_ALERT_DAYS = {7, 3, 1, 0}
+
+
+def _get_recipients_by_roles(roles):
+    if not roles:
+        return []
+
+    users = frappe.get_all(
+        "Has Role",
+        filters={"role": ["in", roles]},
+        fields=["parent"],
+        distinct=True,
+    )
+    user_ids = [u.parent for u in users]
+    if not user_ids:
+        return []
+
+    return [
+        u.email
+        for u in frappe.get_all(
+            "User",
+            filters={"name": ["in", user_ids], "enabled": 1},
+            fields=["email"],
+        )
+        if u.email
+    ]
+
+
+def _already_notified(subject):
+    return frappe.db.exists(
+        "Notification Log",
+        {"subject": subject, "creation": (">=", nowdate())},
+    )
+
+
+def notify_expiring_documents():
+    """Notify on expiring Truck/Trailer documents (Document Attachments)."""
+    today = getdate(nowdate())
+    roles = ["Fleet Manager", "Logistic Master", "System Manager"]
+    recipients = _get_recipients_by_roles(roles)
+
+    rows = frappe.get_all(
+        "Document Attachments",
+        filters={"parenttype": ["in", ["Truck", "Trailers"]]},
+        fields=["name1", "reference_number", "expire_date", "parenttype", "parent"],
+    )
+
+    for row in rows:
+        if not row.expire_date:
+            continue
+        exp_date = getdate(row.expire_date)
+        days_left = (exp_date - today).days
+
+        is_expired = days_left < 0
+        if not is_expired and days_left not in DEFAULT_ALERT_DAYS:
+            continue
+
+        if is_expired:
+            subject = (
+                f"Document expiry Reminder: {row.parenttype} {row.parent} "
+                f"Document {row.name1 or row.reference_number} expired"
+            )
+        else:
+            subject = (
+                f"Document expiry Reminder: {row.parenttype} {row.parent} "
+                f"Document {row.name1 or row.reference_number} expires in {days_left} day(s)"
+            )
+
+        if _already_notified(subject):
+            continue
+
+        if is_expired:
+            days_ago = abs(days_left)
+            message = (
+                f"{row.parenttype} {row.parent} document "
+                f"{row.name1 or row.reference_number} expired on {exp_date} "
+                f"({days_ago} day(s) ago). "
+                "Please update the document validation."
+            )
+        else:
+            message = (
+                f"{row.parenttype} {row.parent} document "
+                f"{row.name1 or row.reference_number} expires on {exp_date} "
+                f"({days_left} day(s) left). "
+                "Please update the document validation."
+            )
+
+        frappe.get_doc(
+            {
+                "doctype": "Notification Log",
+                "subject": subject,
+                "type": "Alert",
+                "document_type": row.parenttype,
+                "document_name": row.parent,
+                "email_content": message,
+                "for_user": "Administrator",
+            }
+        ).insert(ignore_permissions=True)
+
+        if recipients:
+            frappe.sendmail(
+                recipients=recipients,
+                subject=subject,
+                message=message,
+                now=True,
+            )
diff --git a/vsd_fleet_ms/vsd_fleet_ms/doctype/trips/trips.js b/vsd_fleet_ms/vsd_fleet_ms/doctype/trips/trips.js
index d58c16e..aa84646 100644
--- a/vsd_fleet_ms/vsd_fleet_ms/doctype/trips/trips.js
+++ b/vsd_fleet_ms/vsd_fleet_ms/doctype/trips/trips.js
@@ -498,5 +498,60 @@ function fuel_amount() {
     '<p class="text-muted small">Total Fuel Rejected: <b>' +
     rejected_fuel.toLocaleString() +
     "</b></p>";
+
+  if (cur_frm.doc.transporter_type !== "In House" || !cur_frm.doc.truck_number) {
+    cur_frm.get_field("html4").wrapper.innerHTML = content;
+    if (cur_frm.fields_dict.custom_truck_tank_fuel_balance) {
+      cur_frm.get_field("custom_truck_tank_fuel_balance").wrapper.innerHTML = "";
+    }
+    return;
+  }
+
   cur_frm.get_field("html4").wrapper.innerHTML = content;
+
+  frappe.db
+    .get_value("Truck", cur_frm.doc.truck_number, "trans_ms_fuel_warehouse")
+    .then((r) => {
+      var warehouse = null;
+      if (r && r.message) {
+        warehouse = r.message.trans_ms_fuel_warehouse;
+      }
+      if (!warehouse) {
+        return;
+      }
+
+      frappe.db.get_single_value("Transport Settings", "fuel_item").then((fuel_item) => {
+        if (!fuel_item) {
+          return;
+        }
+
+        frappe.db
+          .get_value("Bin", { item_code: fuel_item, warehouse: warehouse }, "actual_qty")
+          .then((b) => {
+            var balance = 0;
+            if (b && b.message) {
+              balance = b.message.actual_qty || 0;
+            }
+            if (cur_frm.fields_dict.custom_truck_tank_fuel_balance) {
+              cur_frm.get_field("custom_truck_tank_fuel_balance").wrapper.innerHTML =
+                '<p class="text-muted small">Trip Tank Fuel Balance: <b>' +
+                balance.toLocaleString() +
+                "</b></p>";
+            }
+          });
+      });
+    });
 }
+
+
+frappe.ui.form.on("Trips", {
+  stock_out_entry: function () {
+    fuel_amount();
+  },
+  fuel_request_history: function () {
+    fuel_amount();
+  },
+  total_fuel: function () {
+    fuel_amount();
+  },
+});
diff --git a/vsd_fleet_ms/vsd_fleet_ms/doctype/trips/trips.json b/vsd_fleet_ms/vsd_fleet_ms/doctype/trips/trips.json
index 1475029..959a785 100644
--- a/vsd_fleet_ms/vsd_fleet_ms/doctype/trips/trips.json
+++ b/vsd_fleet_ms/vsd_fleet_ms/doctype/trips/trips.json
@@ -70,6 +70,7 @@
   "fuel_stock_out",
   "reduce_stock",
   "html4",
+  "custom_truck_tank_fuel_balance",
   "column_break_c2lwo",
   "stock_out_entry",
   "section_break_vefjo",
@@ -548,6 +549,11 @@
    "fieldtype": "HTML",
    "label": "Fuel Amount"
   },
+  {
+   "fieldname": "custom_truck_tank_fuel_balance",
+   "fieldtype": "HTML",
+   "label": "Truck Tank Fuel Balance"
+  },
   {
    "allow_on_submit": 1,
    "fieldname": "trip_completed_date",