Nilight 15 to 30 Amp RV Power Adapter 110 Volt Heavy Duty Plug 5-15P to TT-30R 15A Male Plugs to 30A Female Receptacle for Generator Camper Caravan Electrical Converter

Just use a standard wall outlet! It has worked for me for weeks so far. (I can't run the trailers electric water heater and AC at the same time though or I pop a house side breaker -- only 15 amps on standard outlet) https://www.amazon.com/dp/B0C33TS2ZR?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_2&th=1