I am looking for an extension cable for the Mobile Connector that would allow me to use all of the adapters I already own. I don’t want to have an extension cable just for NEMA 14-50 or NEMA 5-15, because then I’d need an extension cable for each and every adapter. Is there an extension cable, after market or otherwise, that allows the use of any adapter? I see a place called Quickchargepower.com that will extend your UMC if you send it in to them at a cost of $50 per 10 ft of extension. Are their plans out there that describe how to DIY?