Wifey wants an electric kettle.
There are, generally speaking, two ways to boil non-trivial quantities of water in a campervan:
propane - a $40 method that works all the time. Also accepted: butane.
off-grid electric - $1000+ method that works some of the time
You’d think this would be a no-brainer, but “electric kettle” comes up over and over. I think this is a framing error, the failure to realize that a campervan is not an apartment.