Quick Products Twist Lock Adapter Cord - 30A Male to 50A Twist Lock, 12 in. QP-30M50T012 - The Home Depot
RV Power Cord Adapter 15 Amp Male to 30 Amp Twist Lock Female - RecPro
Amazon.com: 3 Prong 30 Amp Twist Lock Adapter, Generator to RV Adapter Cord with Handle, L5-30P Twist Lock Male to TT-30R Female, Heavy Duty STW 10 AWG for Generator to RV Trailer
Power Cord Adapter; Mighty Cord ™; 4 Prong To Two 30 Amp Female; 30 Am – The RV Parts House
GearIT 50 AMP Male (NEMA 14-50P) to 30 AMP Female Twist Lock (NEMA L14