I carry a 25 foot extension cord... never had to use it... YET
But I also carry a 15 foot sewer hose and three 10 foot extensions for it too...
Those I've had to use...
After you've owned several RV's it gets redundant when they give you $150 store credit to get you a starter kit
This time I took the 25 foot 50 amp extension cord. at least I got it if I ever need it..