Most heloc's are set up that way and many find them selves in trouble when economy changes.I would NOT do this to buy rental property unless you were buying some of those super cheap homes in the NE  say 20-k all in that rent for 800.. and your right there to watch them like a hawk. maintenance and cap ex will eat up your money quicker than you relalize I would only do this kind of capital for quick flips in and out profit each deal.  

Usually the smaller parks like this don't follow the same rules of park valuation ( i.e. less desirable, no economies of scale , limited buyer pool, ) 

The annual maintenance doesn't all have to be done on the same, day, week or even month - - the workload can be spread so as to not exhaust you and to allow supplies to be acquired while enroute to the property.Works for me.

A) The economy heated up substantially with a lot of economic growth, If that happened your rents should go up as well.

It can be as economy of scale grows.  

You might have to work harder to find a "good deal", see what is happening with your economy, and maybe lower your expectations to survive.  

Economy in West Texas is strongly driven by the price of barrel of oil here.

Its economy is so diverse it has survived that pretty well.  

(Also, if you can snag a triplex or fourplex, that will give you more economies for scale.

With a strong economy, growing population and five military bases, you'll make a great choice coming here.