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An extendable-retractable step system for a recreational vehicle (RV) has a step tread attached to a slider rod via side arms that include one or more locking tabs, and includes a pair of end plates having tab-receiving slots and notched slider slots that define extended and retracted positions. A m

An extendable-retractable step system for a recreational vehicle (RV) has a step tread attached to a slider rod via side arms that include one or more locking tabs, and includes a pair of end plates having tab-receiving slots and notched slider slots that define extended and retracted positions. A method of assembling the step system and mounting same to a vehicle frame without using specially adapted tools includes the steps of mounting one of the end plates to the vehicle frame, inserting the ends of the slider rod into the slider slots, mounting the other end plate to the vehicle frame, and resting the locking tabs in the tab-receiving slots.

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1. A step system for a recreational vehicle, comprising: a step tread unit comprising at least one locking tab at an at least one end of the step tread unit; a first end plate adapted to receive a first end portion of the step tread unit; and a second end plate adapted to receive a second end p

1. A step system for a recreational vehicle, comprising: a step tread unit comprising at least one locking tab at an at least one end of the step tread unit; a first end plate adapted to receive a first end portion of the step tread unit; and a second end plate adapted to receive a second end portion of the step tread unit; wherein the first and second end plates each comprise a flange extending under the step tread unit and the flange of at least one of the end plates comprises at least one tab-receiving slot adapted to receive the at least one locking tab; said step system may be substantially simultaneously assembled and mounted to a frame of the recreational vehicle. 2. A step system for a recreational vehicle, comprising: a step tread unit comprising at least one locking tab at an at least one end of the step tread unit, the at least one locking tab extending downwardly from each of opposite ends of the step tread unit; a first end plate adapted to receive a first end portion of the step tread unit; and a second end plate adapted to receive a second end portion of the step tread unit; wherein the first and second end plates each comprise a flange extending under the step tread unit and each flange comprises at least one tab-receiving slot adapted to receive a respective one of the locking tabs; said step system may be substantially simultaneously assembled and mounted to a frame of the recreational vehicle. 3. A step system for a recreational vehicle, comprising: a step tread unit comprising at least one locking tab at an at least one end of the step tread unit, the at least one locking tab extending downwardly from each of opposite ends of the step tread unit; a first end plate adapted to receive a first end portion of the step tread unit; and a second end plate adapted to receive a second end portion of the step tread unit; wherein the first and second end plates each comprise a flange extending under the step tread unit and each flange comprises at least one tab-receiving slot adapted to receive a respective one of the locking tabs, the locking tabs and the tab-receiving slots being situated to define a retracted position of the step tread unit, at which each locking tab engages the respective tab-receiving slot, and an extended position of the step tread unit, at which each locking tab abuts an edge of the respective-flange; said step system may be substantially simultaneously assembled and mounted to a frame of the recreational vehicle. 4. A step system for a recreational vehicle, comprising: a step tread unit comprising a slider bar and at least one locking tab extending downward from at least one end of the step tread unit; a first end plate adapted to receive a first end portion of the step tread unit; and a second end plate adapted to receive a second end portion of the step tread unit; wherein the first and second end plates each comprise a slider slot adapted to receive the slider bar, each slider slot comprising an elongate portion intermediate a plurality of notches, the notches defining at least a retracted position and an extended position, and a flange extending under the step tread unit, at least one of the flanges comprising at least one tab-receiving slot positioned correspondingly to the at least one locking tab and adapted to receive the at least one locking tab so that the at least one locking tab engages the at least one tab-receiving slot at the retracted position and the at least one locking tab abuts an edge of one of the flanges at the extended position; said step system may be substantially simultaneously assembled and mounted to a frame of the recreational vehicle.