(I could also PM you to discuss) My thoughts would be to offer a flat rate for essential services that would include all supplies. 

There just isn't a good supply of help.  

These are regulated by the DMV and are RVIA certified units. 

Housing Supply ExplainedHere's an article explaining housing supply and what kind of numbers you should be looking for.

http://www.har.com/content/newsroomHighlights: Single-family home sales rose 4.0 percent with 4,933 units sold, the second monthly gain of 2017;Total property sales increased 7.1 percent with 6,111 units sold;Total dollar volume jumped 13.1 percent to $1.6 billion;At $220,000, the single-family home median price rose 7.3 percent to a February high;The single-family home average price climbed 6.7 percent to $280,175, which was also the highest level for a February;Single-family homes months of inventory edged up to a 3.5-months supply;Townhome/condominium sales shot up 17.1 percent, with the average price up 0.8 percent to $204,397 and the median price up 8.0 percent to $162,000;Leases of single-family homes rose 8.5 percent with average rent down 2.1 percent to $1,652;Volume of townhome/condominium leases was unchanged with average rent down 3.5 percent to $1,478.

I'm pointing out that these regulations that we have in California may be similar to Texas.

They can, however, require licensing and regulate them.

Bank (which does their own vetting) to comply with anti-money laundering laws, CFPB requirements, Fair Debt Collections, and Gramm-Leach-Bliley regulations.

I get nervous when values get like this...Is the area legitimately growing at a pace that the desired housing supply can't keep up?

The Illinois Manufactured Housing Association is currently fighting two bills in Illinois that would allow rent control law and regulations.