I looked into buying a few photography studios a few years back and the books looked very similar - with a loan to pay on the property there'd be no income left over for the owners. (all were looking to retire and owned the building/property/studio/business free and clear).
Not sure if a commercial loan would be any different on a CG vs any other business, but 10 or maybe 15 year loan term is all one can usually get - $2.5mil over 15 years at what, 6% is gonna run $250k a year. Most employees would be seasonal - office/gate/store person, grass/mtce person, some part time help for long days, weekends, holidays perhaps $45k in labor (also figure as owner you may fill in or have one of those jobs and will work winters if needed - so $40k for you - $90k all told.)
Taxes can be looked up but vary by area a lot I'd imagine.
Utilities - usually can calll the elec company with an address and get an average bill for the past year (something to do next rainy day!).
Unknowns would be overall insurance and maintenance - roads (gravel) fire rings elec outlets, water/sewer, trash, bathrooms/showers, pool and other amenities.
RV Parks and Campgrounds for Sale - 856 Found
has a listing of ones for sale...$150k to at least $3.5m!