I am taking a road trip over the holidays and my host has a standard 5-15 120V outlet and a 3-prong 10-30 dryer outlet. I have the 14-50 Tesla charging adapter. Rather than buy the 10-30 charging adapter from Tesla, I got a 14-50 to 10-30 adapter. So I would use the 14-50 on the Telsa mobile charging, and then use the 10-30 adapter on the 14-50 plug. The adapter I bought is listed as being compatible with EV charging, but who knows if these Amazon sellers are accurate. My first question is, would cause any problems? The 10-30 is 3 prong. I'm not an electrician, but I believe that 4 prongs are better, being wired to both neutral and earth ground. I plan to alter the car charging settings to lower the current draw to 20 amps, in order to avoid tripping my host's circuit breaker. My second question is, if I used a 14-50 30' extension cord, would this cause problems? The extension cord is sold for RVs and is absurdly thick. I don't expect this cord to cause any electrical problems, but you never know.