But am trying to scale up the volume that I am doing on an annual basis for 2019.Would love to hear others thoughts on this !

These are expensive but if you are working with a management company that specializes in large properties they might have this service and can pull reports for you.But even the paid services are no substitute for good old-fashioned shoe leather.

For example, do you upcharge by the hour, or by a percentage of the repair cost, for a large repair/maintenance project? 

I used to do accounting for a large church daycare and had some reporting needs.

I'm part of a local REIA and know a lot of commercial and large MF investors, but I have to say,  MHP's are never discussed around here. 

Yup go to a local credit union or community bank.. a bank that is say less than 3 billion.. and preferably ones that are like 500 million..their charters are written to serve the immediate community... forget large national or semi national.. and be very leery of broker chains and those that promise things and want ANY up front money.

Worse, if the market crashes now their best case scenario is they buy now for the same price they could have bought for then, but they missed out on the investment return and tax benefits in the mean time.The overall economy at large is pretty strong right now in many areas. 

If you're looking to spend more, there's always wood-look ceramic tile which a lot of restaurants and hotels are using these days.If it's not a large area and you have a healthy budget, there's always oak.

Is the 6-12 month closing time normal for these kinds of large land deals?

A balloon payment is a large payment to pay off the remaining balance.Here's how it works.I bought the property for $400,000.