I've recently bought a Trailgator second hand on ebay.
For the life of me I can't get it to fit my bikes which have 30.9 seat posts. The instructions (online) say it wil go up to 31.8 seat post size, but there is no way it will fit. I've even take the bracket apart and bent it open a bit more!
All I can now think is that older versions were made for smaller seat post, and the more modern ones are made for wider seat posts?