Thanks Jerry for your reply,
What you are said makes a lot of sense. I can't quite picture what the skid plates look like. I think the idea of having the channel taller at the back of the trailer is a good idea, considering it will be deeper in the water back there. I also like the idea of having a mast support attached to the trailer rather than supported on the boat, and the tongue extension that attaches to where the hitch ball is.
Neil A378