My concern with your park would be how to make the numbers work with only 8 homes  Rents would need to be fairly high and/or price very low for these types of deals to make financial sense. 

I wouldn't be too concerned about hurricanes blowing it down.

Another thing that I'm somewhat concerned with is the tax lien on the property, assuming I package that in to the ARV algorithm?

I totally understand that line of reasoning and wanting to get away from the traffic and all the other negatives that accompany big city living.

I’m actually reading Brandon Turner’s ‘the book on rental property investing’ and there is so much good stuff in it, I’m just concerned because it’s based in America that a lot of parts are different here in Aus! 

I would suspect that a buyer’s agent’s goal will be the sale, and will be less concerned with your long term contentment with your purchase.

I’m specifically concerned about the following:1) Compliance with state/federal regulation of investment advisers.

So if paying a heloc off on your sale reduces the net proceeds that simply means that you'll either have to take out more debt or add cash of your own to meet the purchase requirement.Whats more of a concern would be how and when you access the heloc. 

Why aren't we concerned about equity at first without down payment?

What I’m concerned about - Property taxes - Given that Im going to be out of state for atleast a few years, I understand that there isnt a cap on the property taxes.