I need to replace the roof on my house.

What is the best place to secure financing for a multi-build project like this?

The only time I ever see any significant number of trailers for sale that can be moved is during freeway expansion projects - and most of those projects that would effect a park have already been completed.Also, actually moving one of these things is task of monumental proportions. 

Any major problem (roof, basement, conditioner, driveway, tenant turnover, etc) may cost 5K. 

Get good properties in good areas and get a good screening process in place.Other risks, include regulatory risks which I think are in proportion to the size/scope of projects you take on (if you're fixing up houses lets say before renting them).Other risks include common maintenance items. 

I am getting a number of opportunities to buy properties that I want, but simply dont have the money to jump on them because it is tied up in my other projects.

Now I am once again ready for another project and looking for some good commercial property.

Built in they early 90's and the roof has been replaced in the last 4 years. 

I currently work as a project manager for a general contracting company and have been involved with construction my whole life (my dad is a small construction GC himself).

You cannot properly compare the numbers until you have ironed out the details on cleaning and have a good sense of projected price, seasonality, and vacancy.