Zenith Vehicle Contracts is to use 1link Disposal Network to sell on its vehicles.
Zenith currently has a fleet of 18,000 units and heretofore has disposed of 60% through a network of local motor traders.
Due to the size of its operation, additional sales routes are now needed.
1link Disposal Network was chosen because it allows control of all aspects of the disposal process online.
Ken Trinder, head of business development at epyx, the company behind 1link, said: "1link Disposal Network has been one of our fastest growing e-commerce products and there is high level of enthusiasm for it among fleets, dealers, auctions and others involved in the disposal process."