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A few of us have done the same. Around 10% is the gain.
Weight doesn't cost much.
My Kangoo averaged 6.7 city (16mph average speed) and on a really bad day 9.7 with a 500kg+ trailer.
If you work that out that's 0.006l/100km per kg, including the aero and rolling drag of a trailer.
I can't imagine 50W of solar in Denmark does much. I've got 340W in Australia and it's not enough to keep up with the injection and ECUs (diesel). My previous 100W panel barely made a dent in my Petrol Kangoo's electrical usage, but topped off the battery nicely when parked.
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