The viral anti-Karen Bass video that lit up social media is now rolling through the streets of Downtown Los Angeles in what may be one of the boldest political stunts yet in the city’s increasingly chaotic mayoral race . Two massive billboard trucks circled City Hall for hours Tuesday carrying the now-famous “Spencer, take out the trash” campaign message tied to Pratt and his rapidly growing online political movement. The phrase plays off the Spanish word “basura,” meaning trash, while taking direct aim at Bass and her administration. Two viral Spencer Pratt campaign trucks circled Los Angeles City Hall on Tuesday carrying anti-Karen Bass messaging tied to the now-famous “Basura” political campaign. Obtained by the CA Post A mobile billboard truck promoting Spencer Pratt rolled through Downtown Los Angeles Tuesday as part of a viral anti-City Hall stunt.…