To be honest, the lack of "usable" wifi in so many RV Parks is one of the reasons why we bought a condo for Snowbirding. All we need to do is check email, so we know our business is still running smoothly in our absence; yet being able to do that is always a cr**-shoot. We know about mobile hotspots and satellite connections - but we had neither as we headed south last winter, since we planned to stay in "good parks with WI-FI". By the time we reached FL - we felt that the whole RV Snowbirding thing just wasn't going to work for us.
I found the easiest time to actually get online was in the wee hours of the morning - before all the Bandwidth-Hog kids woke up or the adults started streaming movies.