Booking and Accounting Management System for Car Rental

I`m looking for developing a booking management + accounting system for Car Rental firm. I`m looking for a backend system which will be used for booking, Customer and account management. Basically we will use this software for: 1) Rate management 2) Enquiry management 3) Lead converstion 4) Vehicle allotment via SMS notification to customer and driver. 5) Billing and account 6) Customer / Travel Agent management 7) Driver management 8) Various reports pertaining to Trip and vehicle reports, customers, Travel Agents or sales etc. Anyone with previous experience in developing such a software will be given preference. Please provide details about work done on similar software development.