Fermion
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The problem is, once in awhile, maybe 4 times a year, we take a 200 mile round trip to the larger city. That would get quite annoying with a tiny battery that could not even make 1 way.I don't think solar on the vehicle would ever make sense money-wise. You'd be better off just charging from a 110v/15a socket.
Also a 100kwh battery is a heavy (and expensive) thing to lug around for 2 to 8 mile trips.
We can do the math on the solar. Assume you get 5kwh a day from the 1600 watts of panels, which are $0.50 a watt, or $800. At our rate of $0.12 per kwh, that is $0.60 a day. In a year, that is $219. Aside from opportunity costs of the $800, sounds like it would pay for itself in under 5 years.