I’m not sure all of the regulations/rules to this in PA though.

There are a lot of rules when it comes to buying a MH and if one thing is wrong the lender will deny the loan.Mostly pay attention to year built try and stay away from Mobile homes that are older than 20 years. 

You can find duplexes under $180K in C-class neighborhoods, in decent condition, that meet or exceed the 1% rule

I agree with Patricia, but there are always exceptions to every rule.

So if I understand this correctly, by qualifying to extend the 5 year rule to 10 yrs, $250k if single or $500k if married of proceeds from this sale would be exempt from capital gains? 

I agree with the time/effort rule.  

However, I have found trails of information on the internet and FHA-type websites indicating if you relocate due to work, that you are not bound by the 1-year rule once you begin at your new place of employment.

I think demand is decent.If you're looking in a flood zone you'll definitely want to understand the FEMA 50% rule.

If there are items of value left behind, or even personal items of sentimental value, I will follow the abandonment rules to a "T" to avoid any legal issues.

On a worldwide basis, the US is considered a business haven where many can hide their identities.