Bring a trailer for boats?

Hi all, 

I I have a Malibu skier boat that I need to sell. I'm not sure what it's worth. Is there a boating equivalent to bring a trailer where I could look to see what prices people have recently paid for similar boats?

Yachtworld.com is more the autotrader.com of boats.  

Facebook marketplace is effective also. 

These sites won't give "what they sold for" but it will show you "what are others currently asking" for the same/similar boat.

BAT has a boat category

https://www.screamandfly.com/forumdisplay.php?7-Hulls-up-to-20

if you dare. those guys are serious

Well when BaT was a site for selling cars, that, well, literally needed a trailer to pick up, and us blue collar guys could afford, I wouldn't have recommended them. Boats in my price range - the trailer is worth more than the boat!

for the sites recommend, average asking price, seems to run just about double actual selling price.  More, for the "I's knows wat i's gotts" ads. 
I rarely use e-bay, for reasons, but I have heard there is a way to look up what stuff actually sells for, not just asking price.