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...

Basic plumbing, electrical, HVAC knowledge will go a long way.

Quote from @John Williams: I would only support this because it's California where electric cars are most likely to be mandated and used.

Here are the numbers I know so far:Rents4 units all currently occupied on one year leases- #1: 1/1 $995 monthly- #2: 1/1 $995 monthly- #3: 1/1 $995 monthly- #4: 2/1 $1,100 monthly- Gross rents: $4,085 monthlyExpenses- $12,070 taxes annually- $350 monthly insurance (my estimate, they have liability only right now)- $175 monthly landscaping- $120 water (electrical on separate meters, tenant pays)- Total expenses: $1,651 monthlyNOI around $2,434 before vacancy, maintenance, and management (although i would likely self-manage these)Property needs about $50K in other repairs and udpates from what I can see.

Gas, electric, cable, internet, and water.

Do you have time and energy for an STR?

You are becoming distracted and diverting your time, energy and resources away from where it should be spent which is locating and acquiring good real estate and then managing it well. 

It's a really high-energy dog and I don't think they take it out often enough, so they play indoors a lot.

Storm ponds, storm drains, flood ways or flood zones, underground electric, fiberoptics, etc.On the concept plan above. 

Though he lived in times that were far more violent than ours, Tsukahara Bokuden still managed to develop a peaceful philosophy and believed that it was better to spend energy learning ways to avoid conflict altogether than to carry a sword and win fights.