It wouldn't be too hard to carry one on an Omnium too, strapped underneath the front rack.
I reckon it'd be pretty easy to make a ladder rack for each side of the Omnium platform, but you'd have to be really careful leaning into corners.
I guess you could fit it higher than the platform itself. Have you bought a cargo bike yet?
@MisterMikkel started
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It wouldn't be too hard to carry one on an Omnium too, strapped underneath the front rack.