Here's what we have, as my partner is about to walk a park with an owner....to get more info to put in a realistic offer:

1. Lot number
2. Year manufactured
3. Roof style
4. DOT number
5. Condition 
6. Ownership
7. Occupied/vacant
8. Current lot rent
9. Wholesale value
10. # bedroom and bathrooms
11. either square footage or dimensions (I don't know what the standard is here)

Any other important information regarding existing trailers?  This is a 28 lot park, the owner owns 26 of the trailers.