It's only for lease-option tenants to be applied to a house purchase at closing only.

This is your standard practice that applies to everybody." 

This link will give you a ton of info on mobile homes in Texas https://www.tdhca.state.tx.us/mh/You can also view any liens and mortgages on mobile homes on the site here http://mhweb.tdhca.state.tx.us/mhweb/title_view.js...If it's in a park you (and the person you owner finance it to) will most likely have to apply to stay in the park.

I suggest you listen to the BP podcast great way to pickup tips you can apply in your journey.

You can tell them you are updating the unit, and they can apply again after the update.  

Does anyone have experience with this type of deal funding and know if the same rules apply as with larger commercial deals?

My screening criteria still applies (with income requirement reduced) though.  

As I'm writing this, I'm thinking about the deals I'm working on now, and I'm using at least 10 different ways, or combination of ways, to accomplish this.The first part of your answer, and the most important part of it, is you have to learn how money works, before you can understand how to apply that knowledge into "no money down" deals.

There are many rules that apply to these, and it may not qualify with such a short holding period. however since she bought it with the clear intent of renting it may qualify. 

Like above, what government authorities do I need to work with, where would I go to apply for permits, etc.