Not sure whether snow on cars is an issue.

however they would do maintenance, clean common areas, trash/snow removal and guarantee no vacancy.

Should be a trussed roof assuming there is a snow load.Really need to see in person to evaluate.

Disadvantages — low appreciation, tenants do get into conflict, more tenants expect you to pay for the snow to be cleared and the grass mowed.

(in a row)I'm not sure all this impacts. who is responsible for snow removal, repairs, etc?

We have broke ground on Thanksgiving week and now as of yesterday we have the first floor framed and will be under roof by the end of the week despite the bitter cold and snow that we have gotten this past week.

I would specify in the lease that tenant is responsible for snow removal and de-icing of stairs and maybe provide a bucket of salt to them. 

Talk to a few roofers I would sheath over. i wouldnt put a second layer of shingles on over the old roof but we're in snow country and i knew the roof was old...

I don't know if winter in texas is as big a deal as it is up here in the northern states where you have to deal with all the snow and cold.

Another 5-7% go toward other holding costs (financing, utilities, taxes, insurance, lawn/snow, etc.).