I recently purchased a used motorhome and then a used tow dolly. The motorhome has an old small 4 pin wiring connector and the tow dolly has a larger 6 pin connector. I have tried to find adapters but no luck. I am thinking of cutting both off and rewiring flat 4 pin connectors on both. Any ideas. Also, I can't find a larger 6 pin connector for the motorhome.