NADA guide pricing for a 2010 Passport 300BH in "good condition" is 12,300-14,800 (low retail to average retail) the list MSRP when it was new was $23,938. So, an asking price of $13,500 is about average for that trailer "in good condition" which means WITHOUT any of the FILON buckling issues.
Those prices are for the location around zip code 65711 and I'd suppose the prices "lag the economic influences" by 3 or 4 weeks, so they may be "very slightly lower than current conditions".....
https://www.nadaguides.com/RVs/2010/...4110115/Values