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Sweden is testing a semi-truck trailer covered in 100 square meters of solar panels
(www.popsci.com)
This is a most excellent place for technology news and articles.
That's basically the way interurban trains operated for years before the highway system and personal vehicles replaced that mode of transport. It wasn't solar powered back then, but the idea makes a lot of sense.
Yeah, I know it's basically reinventing trains, but it would be a great inbetween solution to have trucks stay in a dedicated lane in a semi-automatic mode on long stretches, while they can service the last few kms without having to transfer the load.
If you call them PanoPods you can probably get venture capital funding and then just go buy a train and paint it with a cool design.