According to Official Guinness Records,
The largest parade of Jeeps consists of 2,420 vehicles and was achieved by the Bantam Jeep Heritage Festival (USA) in Butler, Pennsylvania, USA, on 12 June 2015. The Bantam Jeep Heritage Festival attempted this record to celebrate the 75th anniversary of the Bantam Jeep. The vehicles paraded along a 4.4 km (2.75 mile) route throughout downtown Butler.
For a complete list of 2015 records, please visit 2015 Guinness Records in United States.