If you’re aiming to attract higher-paying renters, consider going taller (10-12 ft) for flexibility with larger items or small vehicles—this may boost interest and rental rates.

They have had talks about letting us approve members in the future but I'm not sure if it will happen or not.For us the benefits of higher cash flow outweigh the costs of evictions when they do come up.

People who have money may prefer to seller finance but if someone is retiring they most likely don’t care about a higher sales price they want to avoid the riskYou mention ou have a 100% close rate - then why not just buy it was traditional financing if you really want the deal?

It also appraised ~3% higher than contract price.  

When you start leveraging 90%+ especially with today's higher rates and the high cost of multifamily's compared to their rents, the numbers turn upside down real quick.

Final appraisal came in way higher than we expected and made $57,000 after paying ourselves back and hard-money lender.

I think there may be a market for a lower density campground that offers a higher level of privacy per site with amenities (electric/water hookups, RV dump site, bathhouses, etc...) but...

LTR or Mid-Term RentalIf STR doesn’t work out, consider mid-term rentals targeting professionals, which could offer higher rents and more stability than long-term leases.3.

However, if you can flip it and make a solid profit higher than what you would get out of a cash out refi and/or rents won't cash flow, then flipping makes good sense (unless you need a tax write off but since this is your first investment, that probably isn't the case).  

If you plan on selling other people's houses you can charge for that with a license.If you are only selling your own houses, there is no benefit...but there is substantially higher liability.