Wifi can be ever so slow and have poor coverage, especially at CGs. We used to rely on wifi at the CG we have a membership at. Their wifi was pitiful and when kids got up in the morning and got onto the internet, it would come to a crawl or drop out. Had to get up real early and go down to the clubhouse - not fun.
We only RV in part of the year and now use a monthly Verizon mifi plan. Very good coverage most of the time and fast. Sometimes we can't get a signal, which unfortunately is at one of our favorite CGs. Verizon supposedly has the best coverage. Not cheap exactly but worth it.
DW is an accountant and a certified fraud investigator and has no issue using Verizon for financial matters as long as on an encrypted connection. It's preventing our CCs from being hacked that is an issue.
Nothing is worse than going camping and roughing it and not being able to use a PC. Now we can sit at the campfire and surf the 'net all day long. :W