I recently installed RV30 at home. I did it myself, after PMing a very knowledgeable forum member, that is an electrical engineer.
I used 8/2 wire, due to 75' run. I bought a Connecticut Electric box, that came complete with breaker. You do need to have an understanding of RV electric, if you do this yourself.
Like mentioned earlier, I thought about having an electrician finish the job, after I did all the hard work. I had everything I needed, plus knew where to get help, on this forum, when needed.
I shut the power off, took me all of 20 minutes to make connections, power back on, done! I checked with meter first, plugged it in, works great!
Jerry