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The first thing i'd do is reduce the load on the electrics-try LED's for the brake lights, turn signals, interior and dashboard. Getting LEDs for the headlights would reduce the load the most, but you might have to experiment a bit to get the high-low beams at the right brightness, and you'd have to check your state's Inspection regulations-it might not be legal in your state.
Also, you could replace the standard Battery with a Deep Discharge version-US Battery makes 6V, 8V and 12v wet cells at over 150Ahrs! You'd still have to charge eventually, but you'd get a much longer range in the meantime, and you would still get a partial recharge from the Kubota.
Is your Beetle a complete hard-top, or does it have a removable Sunroof section? You could always fit a modest-sized Solar PV panel into a Sunroof panel-and if you don't have a Sunroof you can always place several small ones under the Rear Window. Since we're talking about a single battery you'd likely get enough charge in an afternoon to run all night on...
And all this is assuming that you can't adjust the Kubota's generator-which you most likely can.
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