Lots of good information given here.
One thing I would add; don't invest so much in the park that
you have to charge astronomical rates to get decent return on
your investment. Have seen it done before and it's a tight
line to walk; keep rates low enough to compete with other local
parks, or raise them high enough for a fair ROI.
There are several RV Park construction consultants in the USA.
Haven't used one but that might also be worth exploring.
A few years ago the National Association of Campground owners published
costs for building RV parks. Their study indicated in order to
build a park with the desired amenities(not including cost of
property), the cost was approx. $12,000 per site, based on parks
of 100 sites or more. That's for turn key job, obviously more
now. Also you can cut cuts if any of your family members can
do part of the park building, or at least act as construction
supervisor.
Good luck on your decision, it can be a great investment if
the location is right and built right.,
