Through axles wouldn't make a massive difference to braking power. They'll stiffen up the rear triangle and the fork somewhat, but I'm not sure that'll make a noticable difference to a cargo bike. That being said, it'll be the standard disc brake axle format soon, so there's no reason not to do it.
Rear clearance has always bugged me a bit on the Omnium, I'd like to able to run a tyre to match the 1.6" on the front. Again, no real reason not to run a big tyre on a cargo bike.
Through axles wouldn't make a massive difference to braking power. They'll stiffen up the rear triangle and the fork somewhat, but I'm not sure that'll make a noticable difference to a cargo bike. That being said, it'll be the standard disc brake axle format soon, so there's no reason not to do it.
Rear clearance has always bugged me a bit on the Omnium, I'd like to able to run a tyre to match the 1.6" on the front. Again, no real reason not to run a big tyre on a cargo bike.