We've used a cradle that consisted of 4 posts (4x4 square tube) c/w adjustable pads connected with scaffold type scissor braces. Easily fits into the back of a small truck or van when collapsed. I believe a company in the Okanogan area of BC produced them.. Worked great. A long ways from you but I could try to find out the company name if you like.
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345 "FastForward"