How to use a NADA Guide

[bocotim]

Real basic question here:

When trying to figure the "Average Retail" value of an AS trailer using the online NADA guides, the NADA page lists many features (some that are standard options on the trailer and some that are not). You are able to select features like appliances, A/C and heating choices, microwave, LCD TV, etc.

Are you suppose to select *just* the non-standard features or are you suppose to select *everything* that is installed on the trailer?

For example, a furnace comes standard on the trailer that I am trying to price, but the NADA guide lists several furnace options to choose from. Do I select the furnace option that is installed on the trailer or not? Ditto for the electric hitch, water heater, etc.

Thanks.

Tim