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motorized velomobile VM45 can cruise without pedaling using electric-assist function
(www.designboom.com)
This is a most excellent place for technology news and articles.
Links from the article:
https://www.velomobiel.nl/quatrevelo/ - €10300
Katanga VM45 - guestimated price: 11,000 EUR before VAT for the variant without a motor and around 13,000 EUR before VAT for the motorized version.
Basic physics: each axle adds resistance. There is a 3 wheel 'tadpole' design, so I'm wondering what the advantage of 4 wheels would be.