We have had not had a sink to use since this project started when the person advising from the store stated we would have a temp sink installed.

Guests can't figure out that you rotate it to change temp. 

Thanks @Michael Tempel I will keep that in mind.

Does your friend want to live in Phoenix proper, or maybe Scottsdale, Tempe, Mesa, Gilbert, Chandler, Glendale, or Peoria?

Arizona mobile home park investors in Phoenix, Mesa, Tempe, Gilbert, Queen Creek, or Apache Junction, I'm interested to hear your thoughts-- does having the three pads, as opposed to one, offer any advantage, or would I better off simply placing one new home on the lot and selling it?

With 110 + temps in the summer everything dies if it doesn't get watered. 

Chances are they will leave the heat/AC on, and if you have a down-week, you can just log in and drop the temp to a reasonable level.

They will rent for a few months, get TDY orders (be gone for 6-8 months), put household goods in temp storage (save housing money), then return and repeat 2-3 months later. 

If you fear dealing with tenants moonlight as an assistant Property Manager or temp as a Leasing Consultant.

Hello Hardeek welcome to the D.This is first I've heard of COTS "managing" properties,but hey I guess it was bound to happen to fill the gap.My experience  with COTS in past was same as any other shelter or temp housing type agency, great resource for pool of potential tenants but you still MUST SCREEN everyone and have a process (or your prop mgr) that screens out the headaches.Be careful not to buy someone else's headache,unless that's your goal of course.Invest wisely.