Any other ways to supplement that extra 20%?  

And they must pay for you to buy a supplemental policy if they for any reason do not have that policy in place(it can get cancelled by the insurance company, non-payment, what ever). 

I switch from balance to pure supplemental so the holdings automatically shift to all rentals instead of rental + debt with commercial companies.

As far as the legal side goes, you can literally write the words "Addendum to Lease" on the top of the page and below it put what you want to do as far as inspections and note that the addendum is intended to supplement and/or amend the lease, then have both parties sign and it is a legally binding instrument.

depending on the location and market. it is in a rural area and the owner is ready to move it, you can negotiate an owner finance. i was able to buy one a few years ago from an owner that was ready to move it and i sold her on the monthly payment to supplement their income instead of taking a payout. deal was, 8 years at 6% interest. i am now looking to expand on the park and grow it to 40 lots. rare, but these deals are out there. 

@Teresia Sayler since you're leasing the income producing asset, your income will be the difference between what you pay to the owner of the property and what your tenant pays you until the tenants exercise the option.I'd guess it should be on sch.E because it's supplemental income but not sure where do you put your rental payments though.I was thinking to do the same but decided that double sandwich is too complicated .......after all, it's easier with the property I own rather than lease option.I know people do it all the time .....interested to see how it's taxable, too

I need to take the supplement exam (reciprocity) asap. 

Just curious though, what is the additional benefits that you are alluding to that allows for your mother to form a new LLC and get some form of credit to be used as income supplement?

Will consider working to supplement Bank 2.

We also are not purchasing for income at this time, but as a supplement to retirement in about 3-5 years.