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Old 06-18-2016, 09:33 PM   #1
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Plugging "car hauler' into MH

We're about to obtain our new enclosed utility trailer (v nose car hauler) that will haul our race sled or sxs on the weekend. In the trailer it has an AC unit and a few rv style lights. Our mountainaire has an Onan 5000 generator, is it possible/can we get a 30 amp receptacle installed in the motor home and run the trailer AC off the house generator when shore power isn't available for it? Any thoughts and ideas.... Thank you!

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Old 06-18-2016, 10:20 PM   #2
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I'm assuming you would wire into the current curcuit breaker box in the MH to get the power from the generator.

That's a fairly simple job for a residential electrician. Maybe a half-hour of work after you have the correct parts - a 30-amp outlet and box, enough #12 "Romex" electrical wire to go from the breaker box to the outlet, and a 30-amp circuit breaker that will fit the MH breaker box. That assumes there's room in your breaker box for another 30-amp breaker. If not you'll have to add an auxiliary breaker box near the MH breaker box.

With the short run from the breaker box to the outlet, #12 wire should be heavy enough. I hate working with #10 but that's probably what the pros would use. Or if you have an RV dealer wire it, they might use the expensive 30-amp flexible cable like the cable that goes from the MH to the 30-amp RV plug at a campground to hook up to shore power..

An alternative would be to not use the MH electrical system at all. Depending on how the generator is configured and how accessable it is, run the power cord all the way from the trailer and plug it directly into the 30-amp outlet on the generator. You may need an additional length of 30-amp RV extension cord to reach the generator. But I haul a 25-foot RV extension cord with me "just in case". I don't need an extension cord when parked in an RV park, but I need it every time I park the TT at my son's place in Austin - my normal 30-amp cord won't quite reach the outlet without the extension cord.
Grumpy ole man with over 50 years towing experience. Now my heaviest trailer is a 7,000-pound enclosed cargo trailer, RV is a 5,600 pound Skyline Nomad Joey 196S, and my tow vehicle is a 2012 F-150 EcoBoost SuperCrew.
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