If you are looking to buy a turn-key MHP, I would recommend researching and determining the area of the country you would like to invest in and then locating a MHP Broker in that area that can assist you in locating a park that will fit your criteria. 

He is asking us to deliver back 3% ($4800) at closing from our proceeds.The advantage is it seems this would be a done deal if we agree and he is already living there, and has agreed to forgo any inspection or further negotiations.If we don't not go with him, our agent will show the place, but believes the tenant will be emotional and a potentially jaded resident and wants to be there during each showing.   

If you can get them to execute a DIL then offer cash for keys and have them exit the home (hopefully) in a peaceful fashion We usually don't make the CFK payment until they move out and we get a local agent to inspect the interior. 

Be aware... many turn-key providers are selling homes above what they may appraise for and you may have to bring even more money to the table to close the deal.

Technology and either building your own team, or using a team that has already been established by someone you can trust is key to a successful investment.

Try CTB Contracting, I've used him for all of my work in the past and his crews always delivers quality work

Alternatively, how much cash for keys does one offer?

Maybe delivering pizzas at night, etc.

And in a late market rising interest rate environment debt is what kills the returns on NNN properties.The key to all of these that so many real estate folks forget is that the property itself is really of secondary importance - very counter intuitive to folks who have been focused on the right property and find tenants. 

After 35 years of investing and living through three market and one real estate crash,  I have learned that the key is to stay sufficiently liquid (so you do not have to sell during inevitable downturns) and diversify your assets so that you have eggs in more than one basket.