I have about 20' of 10 gauge 30 amp cord with the camper. I bought a camping worthless 20' 10 gauge extension with 30 amp end connectors that were horrible, constantly losing connection. I have used a 100' 10 gauge husky extension cord without issus except it's too large. I now use a husky 50' 12 gauge extension cord and it works great. Runs AC unit summer and 1250 watts electric heat winter. Also runs 330 watt fridge all year. It's not tough to size and assemble a cable to suit your requirements 30 or 50 amps.