Niftylift HR12 4x4 Bi-Energy Electric Knuckle Boom With its compact dimensions and class-leading working envelope, the HeightRider 12 has always been versatile and reliable. Add to this a low-weight chassis and a powerful four-wheel-drive system, and you've got the HeightRider 12 4x4 (HR12 4x4) - one of the most complete 12m (40ft) self-propelled boom lifts available. Its telescopic upper boom provides increased accuracy when positioning the platform, and 6.10m outreach makes the HR12 4x4 self-propelled boom lift perfect for reaching up and over all obstacles. The HR12 4x4 self-propelled boom lift's deep tread rough terrain tyres provide extra grip even on soft ground. Nifty's trademark 'Bi-Energy' powertrain allows the HR12 4x4 self-propelled boom lift to work in various environments.