In most large apartment complexes, apartments are not allowed to be shown unless the applicant gives their driver's license to the person showing it, to be left in the top desk drawer.It's a personal safety issue.

In the end my friend needs to manage the manager. 

Fill out a normal application with the trust as the borrower, with you signing for the trust as the trustee and you as the coborrower, signing for yourself as the coborrower.It's that simple.

I am a Real Estate Broker/Property Manager in Florida and I often target buyers and investors out-of-state. 

You also run the risk of burning good leads by showing them a filthy apartment.You may want to appeal to your outgoing tenant that each of your goals are aligned, and the sooner you find a qualified applicant, the less showings will need to occur - and the level of housekeeping (or lack thereof) is working against that mutual goal. 

My company works directly with 2000 of these contacts and they are considered our "VIP Buyers" and 62,000 of these contacts are vetted active buyers our dispo managers have added to their list.

But, a funny thing happened on our way to the Forum: we were able to learn first hand how to manage properties, deal with renters (including the House from Hell and the Renters from Hell on our 3rd property), what to look for in deals, etc. 

I was a property manager in Grand Rapids and managed almost 100 doors.

House hacking will also give you some personal "property management" experience.

Soon closing on a property property cost $458k and the closing cost is really high we are doing FHA mortgage they are charging 2% of the loan plus application fee and mortgage insurance on closing for the amount of $7k and plus monthly mortgage insurance... in 2020 there was not just a thing 2% of the loan on mortgage origination loan fee!