Retire the tinfoil hat and use a single computer with good virus software!
Well, that always is an option, but here's why it isn't the best one for me.
Imagine me being in the RV somewhere remote in New Mexico and "the" computer fails. I have no parts stores anywhere near me. I then have to drive who knows how far to find a part. HDD, mobo, whatever. With more computers I have a backup.
Also, one computer is full of movies, TV shows, concerts, like two 2tb drives full. I don't want to mess with that one. The other is the music computer, which is not on the internet, only on my home LAN (which I will have in the RV). The "daily use" computer is for surfing, email, banking, and such... THAT one has the mondo virus and malware software on it. (Here at home I connect through a proxy server, so the virus stuff is on the computer running as a proxy server. I will not have that in the RV so life will change.)
So 3 PCs, all doing different jobs.
Besides I just bought a new tin foil hat.