The flames sparked around 8 p.m. in a neighborhood south of I-20.
Authorities say the fire sparked while the trailer was parked behind a home, but someone moved the big-rig into the road, at the corner of South Einstein Ave. and West McCormick Street.
Fortunately firefighters were able to get the flames put out.
Authorities say no homes were damaged and no one was injured.
Now they're investigating what sparked the fire.