correct, as you'll need external power anyway, so the 'solar' is simply another method to offset 'some' of the generator time, but not a lot - solar is expensive for it's results, and therefore is not really any 'great' return, and certainly 'not' an investment for the 'normal' camping or off-grid situations - it can't run the air conditioner(s), under any 'normal' solar setup, and since you'll still have to have that 'backup' energy source, duplicating your 'investment' seems unneeded.
While many campers 'have' some solar, it's doubtful most owners would ever see much of a difference if they didn't.
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