I tried something I've always wanted to try.
My atrai has a socket for connecting an umbilical cable, but to be honest, I only rarely use it to charge the sub-battery.
It's convenient at RV parks and auto campgrounds with power outlets, which are increasing in number these days, but to be honest, I don't generally use them.
However, it was a waste, so I brought a kotatsu and an electric stove to enjoy it at home.
The kotatsu is an unbranded one that I usually use at home, and the width was perfect.
I don't go camping anymore, but as someone who used to like to just set up a tent at home and spend time inside, it's still fun to do things like this once in a while.
This is the ultimate in self-satisfaction.

[List of tools used]
https://www.amazon.co.jp/shop/dentan

*Amazon links use associate links.