Finally got the new trailer set up for the boat.
I had my welder friend move the rearmost crossmember back about 6" and I extended the tongue 18" by adding a swing away. This allowed me to move the bow stop quite a bit forward. Only problem was the keel wanted to contact the crossmember at the front of the trailer, so I switched to 4x4 bunks with 2x4 pads underneath to get the boat to sit high enough to scoot forward some more.
Sitting nicely now and only had to overhang the bunks in the rear about 3". Even though the boat sits 3.5" higher than how the trailer was originally set up, it's still lower than it was on the old roller trailer. When I was driving back home I looked in the rear view and could actually see over the boat.
Bunks are pine sealed with 3 coats of spar vanish, and the carpet was fastened with stainless staples. The 2x4 pads are PT but nowhere near my aluminum hull.