Dumble | 30 AMP RV Power Cord 25' Foot 30A Power Extension Twist Connect & Light 811498035630 | eBay
Champion Power Equipment 30-Amp RV Generator 30-ft / 1 3-Prong Outdoor Heavy Duty Locking Extension Cord in the Extension Cords department at Lowes.com
Champion 25-Foot 30-Amp 125/250-Volt Fan-Style Generator Extension Cord (L14-30P to four 5-20R): Amazon.co.uk: Everything Else