A liftable platform comprising a platform load sensing system, wherein a platform of the liftable platform is raised and lowered on a lift arm using a hydraulic lift cylinder including a head end and a rod end, the platform load sensing system for detecting an overload condition on the platform of the liftable platform and comprising: a head end pressure transducer positioned at the head end that is configured to measure head end pressure in the hydraulic lift cylinder; a rod end pressure transducer positioned at the rod end that is configured to measure rod end pressure in the hydraulic lift cylinder; a main rotary angle sensor that is configured to measure a lift arm angle; and control circuitry communicating with and receiving input from the head end pressure transducer, the rod end pressure transducer, and the main rotary angle sensor, wherein the control circuitry is programmed to calculate a platform height based on the lift arm angle and to calculate a platform load based on the input from the head end pressure transducer, the input from the rod end pressure transducer, and the platform height, wherein the control circuitry is programmed to indicate the overload condition when the platform load exceeds a predefined load, wherein the control circuitry is programmed to calculate a first lift cylinder force based on the inputs from the head end pressure transducer and the rod end pressure transducer, and wherein the control circuitry is programmed to conduct a calibration sequence by recording the first lift cylinder force at a plurality of platform heights with the platform empty, wherein the control circuitry is programmed to conduct a verification sequence after conducting the calibration sequence by recording a second lift cylinder force at the plurality of platform heights with the platform empty, and characterized in that the control circuitry is further programmed to pass the verification sequence if the recorded second lift cylinder forces agree with the recorded first lift cylinder forces recorded during the calibration sequence within a tolerance. a head end pressure transducer positioned at the head end that is configured to measure head end pressure in the hydraulic lift cylinder; a rod end pressure transducer positioned at the rod end that is configured to measure rod end pressure in the hydraulic lift cylinder; a main rotary angle sensor that is configured to measure a lift arm angle; and control circuitry communicating with and receiving input from the head end pressure transducer, the rod end pressure transducer, and the main rotary angle sensor, wherein the control circuitry is programmed to calculate a platform height based on the lift arm angle and to calculate a platform load based on the input from the head end pressure transducer, the input from the rod end pressure transducer, and the platform height, wherein the control circuitry is programmed to indicate the overload condition when the platform load exceeds a predefined load, wherein the control circuitry is programmed to calculate a first lift cylinder force based on the inputs from the head end pressure transducer and the rod end pressure transducer, and wherein the control circuitry is programmed to conduct a calibration sequence by recording the first lift cylinder force at a plurality of platform heights with the platform empty, wherein the control circuitry is programmed to conduct a verification sequence after conducting the calibration sequence by recording a second lift cylinder force at the plurality of platform heights with the platform empty, and characterized in that the control circuitry is further programmed to pass the verification sequence if the recorded second lift cylinder forces agree with the recorded first lift cylinder forces recorded during the calibration sequence within a tolerance.