Not all campsites have fire Rings installed. I use the inside of an old washing machine the tub on top of an old outdoor table frame that collapses used to have a glass top and it's phenomenal. Happy camping and besides the tub is a thin metal so it's not very heavy until it's full with ashes. And it generates a lot of heat.
Some sites have cement fire pits and others allow your own fire pit. When you book just ask as you will know what site you are staying in.
At tent camp sites there are metal rings designated for fires. Some RV sites also have them, but I don't know if 100% do.
Yes in some areas
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