I think I've seen that you can purchase really good leads by the very few that are highly vetted, but does that work in the MHP space and anyone familiar with companies that do this?

You compare bids from companies for your complex to a cleaner and an STR. 

In the current high interest market, is home equity loan still reasonable?

I own the property 100% (paid cash)  over the property ill be looking for home equity loan to buy and purchase another property,  repeat the process and start the BRRRR method.  

If you are not implementing a value add strategy, you would probably be better served putting a mortgage on the paid off property and/or getting a HEL (home equity loan) as both are fixed rate debt.

This has been happening for decades with Cali companies relocating to Texas.

I would try to make sure a title company is involved, because if you go to sell it later, the title company for the sale may be too conservative about deeds that were recorded without being part of a title insurance policy, if that makes sense. 

Bank rehab loan.

My company leases a property from a private landlord in Glen Ellyn, with permission to sublease.

Looking for something that helps factor in all variables, fixed costs, interest paid on hard money loans, reno costs, etc etc.