Dirty-Pedals

Hi- Several years ago I bought an old adult-tricycle, ripped off the rusty rear basket, and constructed a seat in the space with high mesh on the sides & a foot rest with rollers on the bottom. It's worked great for carrying my daughter with me on rides (she has cerebral palsy) but now her weight is becoming a worry, since she's nearly an adult. Anyone know how much weight an adult trike can carry? And I'm really curious to see anyone else who has built something like this- I looked into commercially made pedicabs & rickshaws but yipe! They run as much as my son's old car! (ok, let's see if I can still do this image thing...) The footrest was added after this pic...