You're correct, don't select those items.
The NADA has the statement
"A PREFERRED OPTIONS PACKAGE IS INCLUDED IN THE PRICES FOR 1998 & NEWER MODELS (EXCEPT MODELS 17A AND 17B). ADD $850 TO SOLARIS MODELS EQUIPPED WITH THE ADVANCER PACKAGE."
The items you identified are part of the perferred options package.
Only select the items from the NADA list that are options on your trailer that were not included in the perferred options packages, such as fiberglass siding, power tongue jack, larger refer, etc. or any after market options you've added.
Hope this helps.
Mary & Tom (aka Hutch)
2015 Jayco Eagle Premier 361REQS
2014 GMC Sierra 3500HD 4x4 CC D/A
Sunlines: 2005 Solaris T-280SR; 1999 Solaris T-2670; 1998 Saturn T-24A