This is very high level info, but I can provide more information once you chose a park.As far as your other questions on choosing the best park to put in your portfolio, I would defer to others as I can only speak to the financing side. 

If you want to sell and use a 1031 exchange to purchase a bigger property or multiple properties you could defer the tax losses and then I think it would be worth looking into.

Purchase price: $395,000 Cash invested: $55,000 We purchased a duplex with a ton of deferred maintenance.

Do you need the cash now or roll it into something bigger and defer the taxes on the sale. 

Because you have to purchase at least as much as you sell to defer all tax in a 1031.  2.5 is 2.5!

Make it a priority to meet with the tenants right away, ask them for any deferred maintenance or anything else that needs to be fixed.

@Garrett Terrell a Solo401k is a great place to grow your net worth tax deferred or tax free.

Don’t want to be stuck with the mortgage plus obligations to fix up the deferred maintenance which caused the violations.

Your QI is right - the responsibility to defer all tax is two fold - you must purchase at least as much as your net sale ($400K) and you must use all of your net proceeds in your purchase or purchases.2.Your one property would count as $160k of purchase using $145K of cash. 

So, part of the money is tax free and the other half is tax deferred, what could be better?