The present study examines the masking effects of interior noise in electric trucks and its impact on the driver's capability to perceive tonal sounds at variable frequencies and amplitudes. Noise inside the electric truck is basically driven by wind and tire sounds that mask the perception of other significant auditory signals. Controlled listening tests were used in this work to measure masking thresholds of various frequencies in an electric truck cabin under different driving conditions. The methodology includes recording interior sound environments, simulating typical driving speeds, and measuring the ability of participants to detect tonal signals in background noise. The results provide a basis for discussion and interior acoustic challenges of electric trucks while extending the current knowledge on how noise environments in these vehicles would affect the drivers' perception. The research is especially important to develop sound design strategies that assure safety and comfort for electric trucks.