I would say that most aluminum trailers used in that size around my area go for $750-$1500 depending on condition. $750 for one that is a wreck and $1500 for a like new condition trailer. The cheapest you can find a boat trailer around here is about $500 regardless of condition. I would say $1000 bucks would be fair but I don't like to buy anything used unless I get it at half of what I think that I could resale it for so I wouldn't give but $500 for one myself. I got a nice older Float on with a 74 sceptre on it for $800 bucks a cupple of months ago myself, but don't think you will find deals like that everyday.