@Don NguyenThis chart from NPR is another I really like.It's clearly targeted at owner occupants, but it simultaneously gives you information on the potential income in residents and volatility over the last 20 years.

I'll add that typically the stock market is much more volatile than rental properties. 

It is not void of volatility but the volatility is a little more predictable and the peaks and valley discrepancy is a smaller percent number.There seems to be some logic that points to you under evaluating some of the assets you are looking at.

Timeshares have volatility of income.  

A small float means high volatility risk and fast downside moves. 

Would they be just as volatile?

I also prefer stable income streams rather than volatility, otherwise I would have just stuck with equities.

(they would give me how ever much I wanted due to me bringing the project forward) My income is very volatile...

I'm planning on saving for 2-3 month of vacancy, however, I see repairs, maintenance and CapEx being a little more volatile.

Volatility will increase.Commodities will go up via inflationary pressures.In short good luck.