Its like they read the thread.
So I clicked on the ad. For $6000, this hot tub is made for camping:
This wood burning hot tub doesn't need to be plugged in or connected to any drain
Fill the tub with cold water from your garden hose and light
a fire in the pit. The fire hot tub holds 200 gallons of water
The water is pushed through the metal coils which surround a wire basket where the firewood is housed
A stainless steel windscreen panel attaches to the chrome pipes to keep you safe from the fires flames while soaking in the tub
Includes a clear top cover with two chrome handles. Please do not leave tub unattended while fire is lit. Extremely hot surface