An empty pedicab isn't must lighter than my loaded rig.

You're probably stronger than me and probably have lower gearing (I couldn't get my biggest cog, out of adjustment), but this ramp is steeper and longer than most parking garage ramps.

If my packages could've walked, I would've instructed them to walk up the ramp and meet me at the top. Can't you just drop your passengers at the garage rather than drive them through it?