You may also try posting in the "Private Lending" forum page.I did want to just mention that I perform Civil Engineering services for developers throughout Texas & have done work on RV Parks before as well as work in Round Rock (different projects). 

Piercing the corporate veil is expensive from a litigation point of view and not something a typical attorney on contingency will go after.Is the LLC bulletproof, hell no.

It's easier to litigate when there are written texts.

A cite civil engineer can charge you for some solution ideas. 

I had S Corp's, LLC and C Corp set up for various businesses with the thought of having corporate shield against litigation.

You can also have this attorney write a letter to the realtor(s) asking for negotiation, or else litigation will ensue.

“I don’t see security of tenure for renters as charity for the needy,” he wrote, “but as a basic feature of a civilized country.”

Should I hire a general contractor, civil engineer and structural engineer to put together a plan?

This is a civil matter and not a criminal one.Now if they return after the lease is up, or damage another unit they aren't living in, maybe you have a case.

Reach out to the seller, let them know you need to come to financial terms on a settlement, or you will be pursuing a civil case as well as turn over the falsified documents to the Attorney Generals office in your state for mortgage fraud.