After assisting CVFD (10) with serious MVA this am, an alarm of fire for a RV/vehicle fire was transmitted in the 100 blk of Maplewood Ct. Crews arrived to heavy fire conditions and quickly knocked down the main body of fire. No extension to residence other than melted siding, crews from SVFD (E51, E52, T50), RVFD (30), CVFD (10) and IOWRS (60) responded to the incident. Cause is possibly electrical.