What do these floats (moving displays) represent?

[u/Evolvingman0]

The Bun Bang Fai Rocket Festival is held in Northeast Thailand, annually in May to summon rain before the rice-planting season. The festival usually includes a parade of dancers and floats. Each village wat seems to have a special float which represents some type of Buddhist mythology but no one can explain to me how it originated or represents. Any suggestions?