All of the responses are just further examples of the value of following this forum! Like others, I had a dedicated 30 amp installed. I converted my barn to storing the 'toys', so had the electrician bring in the service. I know the cost will vary widely by area, etc., but my install cost around a hundred bucks for his work. I added the breaker box myself (now set up with one 30 amp breaker and two 20 amp, and several available for expansion), ran the proper gauge wire, and added high intensity lights. My total bill was right around $175, and worth every penny of it. I had him verify that all my work was to code . . . he's the electrician, and I saved bucks by installing the simple things.
2016 Coachman Leprechaun, 319DS, Motorhome, Dodge Durango Toad