Sorry it wasn't clear. I meant with the bike. If I was doing store front on a bike all I would need, beside my pole, would fit in the bucket. No need for a cargo bike unless I was doing residential and then I would need either a ladder or a wfp.
That said, I would probably just use the small Unger DI filter which would fit on the back of the bike on a small rack. The poles would attach to the main cross bar on the bike. No trailer or cargo bike.
Really if all I did was store front I would use a motor scooter that I could park on the side walk. If I wanted to use pedal power I would use a fold up push scooter that I could easily take onto public transportation (bus/train). My city is so spread out that a bike wouldn't work well at all. Not to mention the streets aren't bike friendly at all.