A power application device (PAD) (10) designed to operate in combination with a four-wheeled vehicle (110) such as a skateboard (112). The PAD (10) includes an attachment tube (12) having a front end (14) and a rear end (16). Between the front and rear ends (14,16) are located a front body support (32) and an optional rear body support (38). To the front end (14) of the attachment tube (12) is attached a handle bar (22) and to the rear end (16) is attached a drive wheel (90). The drive wheel (90) is rotated by a drive-wheel powering means (40) that consists of either a d-c motor (50) or an internal combustion engine (80). The motor (50) or engine (80) is operated respectively by a variable resistor (56) or a throttle control (86) located on the handle bar (22). To operate the PAD (10) a rider stands on the skateboard (112) and the PAD (10) is activated causing the drive wheel (90) to rotate, thereby causing the PAD (10) to move forward in unison with the skateboard (112).