Parking a mobile tiny home on my lot also would violate codes if someone lives in it (had a friend get one shut down for this). the tl;dr is they are cool -  I'd love to see more of them if they are done right, but you'll be fighting a zoning and land use system that hasn't caught up.

If the market or purchasing power drop at all you may find yourself fighting to make a profit.  

Also, in my experience with this, I see lenders that will let you work for just a few months as long as it's full time, part time it needs to be around 2 years.Also, your credit and cash seems good, so that's probably a good sign and will help a lender try to fight your case.

(It was BS but still had to lawyer up and fight it)Some speculation is that since many owners do not live in their jurisdiction and the tenants do, they are the ones that vote for them not owners that live in other areas or states.

My existing contractor just recently had his license temporarily suspended due to unsecured scaffolding and now is fighting a $13k fine in court.

As far as a "sweet spot" I'd say it really depends on what you're looking for... the closer you are to the city the more tenants there are fighting for your unit, BUT with that in mind the closer you are to the city the less cash flow there is. 

Is it worth fighting over?

The high HOA fee had me really worried and I was trying to fight my instinct to find a place.

Wholesalers v flippers v buy and hold.) who gets hit worst and how does each types strategy to fight the downturn differ?

I mean I have been give some awesome off-market deals from Realtors don't get me wrong, but deals that you don't have to fight for seem more appealing to me.