For anyone not reading the article.
The truck came with an 80 AMP charger (I'm assuming it's the one that also lets the truck power the house).
His house is currently only a 100 AMP service, so he would need to update the panel to 200 AMP.
The transformer his house uses and shared with his neighbors is already at capacity and would need to be upgraded (that's the bulk of the 12k charge)
He ended up installing a different 30AMP charger which is still more than he needs (I believe he also acknowledged that the 15 AMP household outlet would also have worked for his needs)