Hello KTIDA - welcome to the forums!
The search function at the top of our page has weaknesses and strengths. But it will work on your question just fine if you put only the word 'composting' in the search field. You will find 74 threads with the word mentioned in it. It looks like http://www.airforums.com/forums/f446...let-45582.html
is one of the better compilations.
Will your camping be mobile or fixed?
RV Dump Stations - Home
is fairly accurate, though not always fully up to date on pay-to-dump rates. Cost usually is not an issue. I think I paid $5 once this reasonably busy past summer.