I have done work on similar web based ERP projects using C#.NET, WPF, WCF, MSSQL Server 2019, RDLC, XML. Additional scope other than your requirements was Maintenance of the Vehicle (Preventive & Breakdown), Notification, Maintenance Order, Inspection, Spare consumption, Maintenance History, Measuring Point for Km Reading and auto Maintenance notification generation, Approval Workflow , Rental Contract, Billing, Additional expenses, Sick, QR/Barcode integration, Maintenance & Calibration Calendrer, Subcontracting etc. Link with Inventory and Procurement module.
Once we freeze requirement, we can finish in less time as per current scope.