New pickups have 4 way and 7 way harnesses. If you can modify your coach for both, you could have the dolly and mag lights hooked up simultaneously. I have made "Y" cables and adapters to accommodate need. Of course, you can always splice into the tow dolly wiring as already suggested.
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Tom and Lisa
Pennsylvania
2015 Challenger 37TB
2015 Ford Taurus toad
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