1983 and 1984 were perhaps Bailey's greatest years, as he won the 1983 250cc Supercross and National Championships, and was awarded the Wrangler Grand National title. He also won the United States motorcycle Grand Prix (USGP) at Unadilla and repeated as Motocross Des Nations champion. The next season, 1984, was more of the same, as David added the 500cc National crown to his resume, won the King of Bercy title and led the USA to victory in the Motocross Des Nations for the third straight year. Bailey would win many more major races in the next few seasons, most notably two more MXdN titles, and coming out on top of a titanic duel with teammate and fellow champion Rick Johnson at the 1986 Anaheim Supercross. Bailey was going faster than he ever had in his life, and many say faster than anyone before, when he rode his Honda CR500 to the win at the Motocross Des Nations that fall. The performance by the US team is regarded as one of the most dominant in history.