Mid-Wheel Drive power chairs are very common such as the following: Jazzy 600 ES, Quantum level, Jazzy Air, Jazzy Air 2, Permobil M3, Permobil M300, Quickie QM710, Pronto (M51, M61, M91, M94, M41). Most units that have electric seat lifts will be a Mid-Wheel Drive designed for maximum stability. Mid-Wheel Drive chairs are also the easiest to load into a side door entry mobility van, due to the sharpest and tightest turning radius on all the power chairs.