yeah public wi fi is a big risk. You can get a hot spot that will basically firewall you. Even you smart phones. Only use it when you need to as data overage are ugly things.
You mentioned a toy hauler and you own room. That sounds like a good way to go. Travel trailer or 5thr? For internet that way the hot spot if you are careful of data. You can also look at wifi boosters with external antennas and the hook the booster up to your own wifi. Vastly more range. There are many technical steps that could be taken to even more protect yourself on the internet, but this thread is not the place for those discussions.
Ken