Abstract: An online trading system for conducting trade of commercial vehicles at a dealership is disclosed. The online trading system comprises an online trading website and a vehicle database built into the website hosted on a server and managed by a commercial vehicle manager at the dealership. The vehicle database is configured to store virtual inventory including a vehicle body data and a vehicle chassis data of vehicles. The website includes an available vehicle combinations list which includes a list of all possible combinations of vehicle by using data about all available chassis types and combining this with available body models that fit each chassis. The vehicle database allows the dealership, at least one dealer, at least one buyer, a body manufacturer or distributor to access the data of the commercial vehicles via a network so as to conduct trade in a simple and efficient manner.