Nice used TerraTrike Rogue in Blue.  The Rogue sports an Enviolo continuous variable transmission for easy "shifting" all the way from slow to fast.  The continuous allows one to pedal at one's preferred speed.  The CYC Photon electric has both torque sensor pedal assist and throttle with plenty of power for the rider.  This trike also includes comfort pedals for safety and a mirror to check who's behind you!