Simply because I had heard so much about how great MH parks are to invest in!

Yes, legal representation can be expensive, but in cases like this, your claim can and should include court costs and attorney fees and that would be more expensive to the landlord than simply returning your full deposit.

Plenty of options if you are creative . . . just remember that the line "buy with no money down" is a con . . . you simply need to find a way to buy with someone else's money other than your own. 

They are simply different. 

Should I simply tell them to keep their AC units at 78 degrees when they are not home?

If I were renting an STR and there was a nearby incessantly barking dog I would simply want to get out of there ASAP.

I am not maligning the brokers they are simply telling the buyers what their options are.

You are thinking it allows you to terminate the lease and you simply can't terminate a term lease until the end of the term. 

The lawyer will simply tell you that if you don't have the COC in place and the home needs work there is nothing you can do but fix it up.  

If you intended to simply buy and hold for 15-20 years?