According to Official Guinness Records,
The longest single chassis parade float measures 38.4 m (126 ft) and was achieved by Lucy Pet (USA), with a float powered by a Ford engine and transmission, designed and built by Fiesta Parade Floats to take part in the Tournament of Roses Parade in Pasadena, California, USA, on 2 January 2017. The float also broke the record for the heaviest single chassis parade float. It contained a wave pool on which dogs surfed as the float moved down the parade route.
For a complete list of 2017 records, please visit 2017 Guinness Records in United States.