Hello, My problem is the max weight of myself and the bike. I'm around 475 lbs and my trike is 112 lbs for a total of 587 lbs. Can't do a front hub because the front brake is a drum brake. It also has a Shimano Nexus 3 speed Coaster brake with dual sprockets(foot activated pedal backwards). 3 gears with Dual Action Handlebar Mounted Thumb Shifter. Because my bike is so odd I'm not sure what motor if any I can use. Any suggestions? Thanks Preston

Picture of my bike below