Even if it were true that all extraction of earth creates CO2 emissions (whether that’s oil drilling or mining for metals used for battery production), we still must always be pumping for oil that will eventually run out and gets harder and harder to extract because of that.

Most of his advice is common sense, straight forward, and not designed to extract extra money from your pocket.  

Assuming we will conduct thorough due diligence on the park infrastructure and utilities, I'm looking for guidance on the following:1) Does anyone have experience in extracting this type of information from challenging Sellers?

What if I told you my local RE have decent cash flow and would have outstanding cash flow if I had not extracted a large amount of money from my RE?  

An average purchase in any of those 3 cities from 5, 10, 20, 30, 40 or 50 years ago would produce better ROI than an average purchase in the great initial cash flow markets.As indicated I have multiple 2% ratio properties (that would have outstanding cash flow if they had not had cash extracted, so they have OK cash flow), but what about the appreciation? 

Unfortunately, gurus are sponsoring meetups for the purpose of extracting as much money as possible from those who are gullible.

Most of what you are calling expenses there are probably part of the improvements needed before placing it into service as a rental, and those would become part of the basis and be depreciated rather than being expenses deducted fully in the 2012 tax year.FMV, as you are probably aware, can be extracted from a number of methods: tax assessor, an appraisal, what you paid plus improvements, etc.

Kind of like taking aspirin instead of making your own willow bark extract.

How much did they try to extract from you?

After 5 years you should just assume you've extracted all useful life out of it and will need to repaint.