I added a second 30A service and use a 50A to dual 30A dogbone to feed both. If 50A is not available I can feed the second 30A feed withj a heavy duty extension cord tied to the 20A pedestal. The second 30A service feeds two separate 110V duplex receptacles with each feed by a 15A CB. A pretty good description along with details of where I gotr the various materials and their cost is in the captions to the pics. The total cost was around 1/2 of just the cost of a detachable 50A shore power cord.
30A DUAL SERVICELarry