I don't know if anyone else is running tubeless on the front of their Omnium/cargo... But after being a bit disappointed with the actual inflated width of the schwalbe G one speed 20x 1.5 tyre, which comes up more like a 1.25, I was struggling to find a good quality, tubeless specific 20"(406) tyre at all, let alone bigger than 1.5...and maybe I'm late to the party here... But I only just realised the other day that Maxxis do a tubeless version of their Torch bmx racing tyre... In a 1.75" width! The mounted width is almost exactly 1.75",its really light, dual compound rubber, bigger width also means slightly bigger diameter, and best of all, they currently have 44% off on the Maxxis website! £19.99 a piece. A damn sight less than the schwalbe.
Today will be my first day working on it, but fingers crossed I've found my perfect front tyre! :)