Estimating Value of Homes

Do any of you have a quick easy method of estimating value of homes in a park that is for sale without reviewing NADA or cross referencing used homes for sale on craigslist? Assuming each was in good condition.

Something like:

AGE RANGE TYPE APPROX VALUE

1 - 5 yrs old S/W 16’ x 80’ 3bd/2ba ?

1- 5 yrs old S/W 16’ x 80’ 2bd/2ba ?

6-10 yrs old S/W 16’ x 80’ 3 bd/2ba ?

6-10 yrs old S/W 16’ x 80’ 2bd/2ba ?

11/15 yrs old S/W 16’ x 80’ 3bd/2ba ?

11/15 yrs old S/W 16’ x 80’ 2bd/2ba ?

Any kind of down and dirty quick evaluation method would be greatly appreciated.