Hardly the "business is booming" sentiment that you read about on Crowdfund Insider (which is nothing more than a PR service for the top platforms). 

You may also want to check out the Property Hub - focused specifically on the UK market: https://thepropertyhub.net/If you're interested in purchasing through an investment house, I work for one that provides 'deals' and an advisory service in the regions we specialise in. 

Hence, lack of punctuation makes it. confusing.Do you  have the land or the mobile under contract with the legal owner?

Generally speaking, documents you may find from online services often lack important clauses that can help shift burdens and costs down the line.

Remember though, you still have to sell them on your product or service.

Do you have property management services that will handle these units?

So you need to get your initial paperwork done with legal counsel (unlike my example) and do it the correct way!  

Do I have the right to bill him the cost to hire cleaning services to move his stuff?

I know that that would not be legal where I am, for a variety of reasons, not even for the 5% fresh air, nor the above ground feet, nor the fact its not on the CO).

Us Consulates offer notarization services.