Here's a rubbish photo of my trailer. I use 4 cradles, no rollers as I'm not a big fan of putting rounded hulls onto a flat roller, and anyway, it's pretty easy to get the boat onto cradles single-handed.

I don't normally put it on the trailer backwards. It's something I tried once, but it's easier to get on and off the other way round.

Cradles are from Vectorworks. The only thing to watch out for is to make sure that you have enough clearance below the dolphin striker if you're going to put a box on the trailer. As you can see, I've got some extra 50mm x 50mm on the arms to lift it up a bit, and to give a wider base to bolt the cradles to.

The arms are adjustable and can be removed which makes it less hassle to tow without the boat or leave in a crowded car park. Also, it adds a little more greyness to the legally grey area of towing 2.5m wide loads in the UK (as in, "the trailer's only 2m wide, officer, it's just that the load is overhanging" <img src="http://www.catsailor.com/forums/images/graemlins/wink.gif" alt="" /> )

Paul