How to keep a huge cargo bike safe in the city? I have been biking for transportation and pleasure the whole time I've lived in Chicago, and I'm familiar with the basics of locking up and storing my commuter bike.

Yesterday I added a Yuba Mundo to my stable because I'm getting rid of my car and I'd like to still be able to go places with passengers. I rode it to the grocery store and was just barely able to lock it to the bike rack there, and only because one whole side of the rack was free. 

A U-lock won't fit around both the frame and a locking-post because I can't get the frame close enough to the locking-post. I've been using Kryptonite cables to tether it to a post, and then locking the U-lock through the cable, frame, and front wheel. I also plan to cover it with a tarp when it's parked on my patio, to keep birds off it as well as to hide it a bit from would-be thieves. Next to the giant tubes of the Yuba, the Kryptonite cable looks like a little thread.

I can't park this thing indoors because it won't fit inside most places (including my third-floor walk-up) and it has me laying awake at night worrying that the cable will be cut.

What other steps besides locking it to itself, cabling it to a post, and covering it with a tarp should I take to ensure the safety of my bike, both at home and out and about?
I'm answering my own question because I took a combination of the steps above, plus some other steps.


I took steps to make getting it back in event of theft more likely: 

registered the bike with the Chicago police: https://portal.chicagopolice.org/portal/page/portal/ClearPath/Online%20Services/Bike%20Registration 
I plan to register it with https://www.nationalbikeregistry.com/ as well
Made sure the store I got it from keeps bike serial numbers on file
Rolled up an extra copy of the receipt, with my name and phone number on it, and put it inside the seat tube
Made sure it was covered on my renter's insurance

I figured out a hardware setup

Heavy chain (the Fuggedaboutit lock+chain) for locking the frame to a post, instead of the flimsy cable.
Tethered the seat to the frame with a small cable
Normal U-lock for locking the front wheel to the frame.

I'm hoping to deter based on looks also

Covering up brand-name info with a unique combination of stickers
Chose a bright, unusual color when I bought it