Six months later (and additional follow up requests)......all I've received is the next invoice for $199. 

Enter a maintenance request, assign a vendor, attach a fake invoice.

Then find someone to come in and verify - I think for one park we used a well driller to come out and check out the system.Then there's the rest of the due diligence - checking financials, bank statements, reviewing invoices, etc, and making sure they P&Ls they've provided line up with expectations.Also with MHPs, keep in mind that it's the lot rent portion that is capped, and not the rental income portion above the lot rents.Good luck with it allWe contracted with @Steve Edel to oversee due diligence for some acquisitions - he might have a more suggestions

For example, if I submit $1,000 worth of invoices/receipts, then they reimburse me $850 and the other $150 comes out of my pocket.  

Are all my invoices uploaded to my owner portal?

(I can help fast, most of the time in as soon as 10 days)e.Ask them if they are thinking of selling or buying a house.f.Always ask them if they know anyone who has a house for sale or is wanting to buy a house.g.Close with handing them a business card and repeating your name with telephone number.i.If they hand you a business card make certain that you put it in your database to prospect to.2.The people you pay or good friends who have service type companies ask them if they would include in their invoice statements a flyer about your services and be ready to do the same for them.3.During holidays and special occasions send to your friends and customer base a thank you card, Birthday card, holiday card, within those cards mention that you accept referrals and include a few business cards. 4.Take up a new interest.

Easy Invoice (such a life savor) 4.)

Are you getting a break out of labor and material with vendor original invoice?