No, owning rental property is not exploitative. It gives people a choice of where to live. No one rental property is required for anyone to live – there’s millions of choices in the United States alone for places to live.
And yes, camping is legal. People camp every single day in the United States. And yes, people own RVs. They live in them and travel around the country. This is legal. Both of these give even more options for places to stay.