Plywood is also lighter in weight and holds up to water better, accepts nails and screws better, stains because it's real wood veneer as opposed to MDF which is usually a paper veneer that does not hold up to water, heat or weight, which is always a factor in kitchens and bathrooms.

@Alissa Engel I think you really hit the nail on the head with your description of Montana markets.

Make sure you have your math nailed down and make sure your vocabulary is flawless. 

The role of the surveyor in this type of situation is to help locate or nail down the "where is the title on the ground?"

The subfloor will be secured and nails/staples will be removed, however, it will not be perfectly flat. 

We then determine from repairman we hire what additional materials (nails, caulking, etc.) he needs per job and we buy those items and have ready at mobile home also?

@Jimmy O'Connor; @Joe Platyan nailed it.

@Jennifer Rysdam first of all NO you can't do a UPS box and have them sign because they can't and won't sign for you and your business, not to mention when they find your doing such you will get nailed for it. 

Also do you have any extra lease provisions, my thoughts are no hanging things from walls to avoid having to patch nail holes but don't know if that is going too far. 

Scott nailed it.