Poor 'PossumI unironically think the Rivendell OM-1 is the most sensible rear derailleur for a cargo bike. Rapid rise sounds like an absolute necessity when you are likely riding around with 200+ extra pounds on you. If your shift cable snaps, you don't want to be stuck in your highest gear as you try to get yourself back to base. I told myself I wasn't gonna go too fancy on my derailleur, but this one just makes too much sense.