Hi there Fulltimer,
I don't see why SBI! wouldn't be a good fit for your existing business? What type of site did you have in mind...informational for RVers and monetizing through getting new clients at your park?
Have you brainstormed (checked Search Engines) what comes up when using keywords such as RV PARK?
SBI! is really a fantastic way to break into website building, though I may be being presumptuous in assuming you have never built a site before (sorry?!!).
Whatever you decide, this forum is a great source for tips, tricks and advice
Best of Luck with your endeavors!