Tripp Lite Heavy-Duty Power Extension Cord, 30A, 10 AWG (NEMA L6-30P to NEMA L6-30R), Locking Connectors, 14 ft. - power - P041-014 - Power Cables - CDW.com
parkworld 36 ft. 10/4 STW 30 Amp 4-prong Dryer Heavy-Duty NEMA 14-30 Extension Cord 886085 - The Home Depot
Amazon.com: CircleCord UL Listed 4 Prong 25 Feet Dryer/EV Extension Cord, 30 Amp NEMA 14-30P/R, Suit for Level 2 EV Charging Such as Tesla Model 3/X/Y/S and 4 Prong Dryer, 125V/250V STW
Camco Extension Cord for RV - TT-30P/TT-30R - 50' - 30 A 55197 | RONA