Thanks for the help fab it ended up being a couple of rollers lop sided i lined them all up and udjusted the skids till they just touch the boat.
i have one more question the 4 short skids that go across the trailer on an angle i have adjusted them up to touch boat aswell but after looking at your pictures i should of left them loose what is the reason they stay loose and is there a specific measurement i should drop them down off the boat.
Cheers