For more pointed advice, you might have better success with more specific questions.... for instance, what are some marketing methods that work for other people, or how do I meet buyers.If you want one big, general piece of advice, it's dig in for the grind. 

Instances like this make me consider looking for other property managers that can offer better service at competitive rates

For instance, the one owner called and asked how much I was willing to offer.

Go back and read the very extensive already existing threads on this subject in the Mobile Homes & Mobile Home Park Investing threads.

For instance, if we found a HELOC for over 80% (say 90%), get that setup, but not purchase our first deal for another 6 months, would PMI come back? 

I beleive both of those will survive although leases in some instances  i think could expire at death.. but check local lawsseller financing survives though pretty sure on that one

I had couple family members buy from these auctions and they didn’t have any issues with titles etc.But obviously you have to be aware and do your research extensively to not end up with a lemon property ( trust me there are plenty).

For instance who you have called who you have touched on ringless voice mail who you have sent mail to?

For instance, make an opportunity to scan the interior of the applicant's vehicle - if it is messy, your rental will be as well.

I'm looking into renting to traveling professionals and most of the folks on that website are looking to rent for 30 days or more up to 6 months and longer in some instances.