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"On a sunny day" is the key thing here. Solar panels produce a fraction of the rated output in even mildly hazy conditions, and in winter horizontally(ish) mounted panels produce basically nothing.
Typical consumer panels are about 200W/square meter (in strong perpendicular-ish sunlight), so that's about 1.8 kW for each of the roof and the wings. If they 130 km extra is on the roof alone then that's the equivalent (130/600)*64 = 13.9 kWh = 7.8 hours equivalent direct sunlight*, which is on the edge of plausibility for a particularly cloudless sunny day in the middle of summer in the Netherlands.
Recharging in 2 days requires (64/2)/(0.2*(8.8+8.7)) = 9.14 hours equivalent sunlight, which is even more optimistic.
(* the sun might be out for many hours more than that, but for most of the day it isn't directly overhead and the amount of power generated is greatly reduced)
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grams
Some Dutch students have built a 2 berth EV camper. They claim they did a 2000km trip on sun power alone. https://solarteameindhoven.nl/article?presenting-our-newest-solar-vehicle-stella-vita
It will probably be 10 years until we can buy such a thing, and more like 20 before most of us can afford it, so I think we should just make one. If you build your own you can probably forget most of those pesky safety regulations but still get it registered. It looks like a frame of steel tubes with a fibreglass body. I wouldn't bother trying to make it pretty. Just start with a 2CV chassis and glue some krabon phaiber bits on.
There aren't many specs available: battery capacity 60 KWh, weight 1700 kg, charging time when stationary 2-3 days, most efficient speed 85 kph, top speed 120 kph, range 600 km, range on a sunny day 730 km, solar panel area on roof 8.8 square meters, area on fold-out panels 8.7 square meters. Average daily distance: 300 km. Total distance driven: 2000 km. I can't quite see how they managed the journey without using charging points. I suppose they started with a full charge, and then kept charging constantly, even at night.
So, who's going to make one? You could start with this 64kWh battery pack from a scrapped Kia. https://www.ebay.co.uk/itm/255025763103 Only £7450. It weighs 457 kg.