Komfort Trailers Resell (bluebook) Value Wanted To Komfort Travel Trailer?

Resell (bluebook) value wanted to komfort travel trailer? - komfort trailers

Hello.
I have a friend who want their supporters in 1981 selling Comfort Lite 15 L. This is a trailer.

I have to search the Internet and ask questions, but can not find the value for this item. (whether new or) used. To make matters worse, the seller does not know how much you paid for it.

I am interested in the trailer, but I have evidence of value.

If anyone knows the value, or I can be a benefit to someone, please do not give the answer.

Thanks in advance!