We were downsized from our jobs at 52 years and we successfully full-timed for 16 years, traveling constantly. We never paid nearly $1000/m for a RV site. There are many places for $300-$400/m and if you like public parks - even cheaper. Of course, if you want to stay in upscale parks then, yes, you'll pay a lot more.
You could also volunteer in national parks, state parks and other public campgrounds and get a free site.
You can learn to boondock, especially out West, on lovely national forest lands or BLM lands.
There are many ways to save money. Hope you succeed in the new lifestyle!
