I came across this kit online. It has everything needed to wire a tow vehicle for adequate charging of the trailer batteries as well as running the refrigerator from the tow vehicle.

TRAC Vehicle Wiring Kit

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Raul

2408T
2010 Nissan Frontier, 4x4, Crew Cab

Wow! 8 Gauge and 60 Amps. Probably more than my 130 Amp alternator could supply (in addition to the needs of the truck). Kinda expensive though - $99. I suspect I could fab something equivalent for much less cost.

- Jack

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Hi-Lo 1707T - Tire Minder TPMS on Tow Vehicle and Trailer, 300W Solar Battery Charger, Equal-i-zer WDH, Progressive Dynamics Converter, Fan-Tastic Fan, LiFePO4 battery 12V DC Electrical System
2014 F150 Platinum 4x4 3.5L EcoBoost SCrew

It's expensive but it's a high quality setup. They are using a nice, waterproof circuit breaker as well as tinned marine wire. The trailer connectors also look like high quality parts.

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Raul

2408T
2010 Nissan Frontier, 4x4, Crew Cab

Nice set-up but not as much fun as Jack's solar panel auxiliary charging unit.

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2201 TL

2010 Nissan Titan king cab SE
4x4

I live in the Pacific Northwest; what is solar energy?

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Raul

2408T
2010 Nissan Frontier, 4x4, Crew Cab

You need a water wheel, don't you?

- Jack

You got that right!

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Raul

2408T
2010 Nissan Frontier, 4x4, Crew Cab

We bought a used Montana highway patrol car and it not only had a 170 amp alternator but 100 amp service ran all the way into the trunk. Too bad its a FWD Impala and can't tow much. I bet the police spec Tahoes would be great for this.