@John FiderI have had good luck with a shingle ripper tool.

If the roof is so bad that some shingles are missing, you can usually see that. 

Brick exteriors, sloped, shingle roofs)Gross Annual Rents: $408k ($654/unit/month).

I feel like it was a rip-off, because they bought it for $39k, painted, screwed tin over shingle roof, and put in granite countertops, then charged me $119k.

Is there missing shingles or windows?

Homes that look like they cashflow may often have knob and tube wiring, lead paint, octopus furnaces lined with crumbling asbestos, unstable stone foundations, plaster and lath walls, roofs with triple layers of shingles requiring tear-off - all requiring expensive renovations. 

From moss growing between the shingles, to water (and possibly mold) in the basement, this one has it all.

.), while property coverage provides coverage for any incidents where the property gets damaged (ex. the roof shingles get damaged by a hail storm or hurricane or the property burns down because of a fire). 

They are on 8" reinforced slabs with proper tie downs and skirted, they all have pitched, shingle roofs.

In order........Make sure the numbers work.Call the listing agent yourself .....let them know you are out of state and you want to know "If I was standing in front of the property, or even just walking though the inside what are some obvious things I would see with the naked eye.....missing shingles on the roof, paint pealing in the back.....holes in the wall, is the property across the street from a graveyard or liquor store, etc."