I was looking at ZF's website for their smaller electric axles, but they have this for city buses:
https://www.zf.com/corporate/en_de/magazine/magazin_artikel_viewpage_22132904.html
What would be sweet would be a 2:1 planetary reduction gear in each hub. They probably supply to Mercedes-Benz. The axle I was looking at is for their urban vehicle, the electric twist beam:
http://www.zf.com/corporate/en_de/products/product_range/cars/cars_electric_twistbeam.shtml