Set it up yourself .. then call and activate on the pay as you go plan. Nobody sets it up except you. Most installers haven’t a clue and rv dealers are mostly who will set it up if you need someone to do it for you. The difference on pay as you go is you pay in advance. You must technically own the receivers, but some have transitioned their “loaned” Home account receivers. With your own receivers they don’t care how much you start or stop it.
Even with a regular home account you can chat ( text) with dish and change locations as many times as you want , with the dish outdoors pay as you go account you can do if with no contact other than the app. I have changed my account as much as 25 times in a year and 5 times one week .. no issues. The only gotcha are taxes you pay. Communication taxes, sometimes high, are based on the locality you are getting your locals from .. for example Oregon had no communication taxes to speak of .08cents..... but Florida near Orlando I payed over 8 bucks!