[Destroyer]

Hi Tom. Welcome to the site. Really not sure of the proper spacing of the bunks since we don't have any dimensions to go by. I'm going to make an assumption here that you have a total of 4 bunks. (2 for each side) Then, if it was me, what I'd do is leave the outside two loose and set my center bunks (one on each side of center) about three feet apart total (one and a half feet each from centerline) and high enough that I know that the boat won't hit the trailer axle or the cross member(s). Then I'd pull the boat onto those bunks. Make sure she is stable. Take some measurements now that you can actually see and measure the bottom of the boat. Put the boat back into the water, set your 4 bunks to the measurements you just got, then pull the boat back onto the bunks that should now be at or near the proper placement. Observe the results and if you're happy with them you're all set. If you need to make further adjustments you can either launch the boat again or do it in your driveway. But this should be a good starting point. BE CAREFUL ....NEVER put your body between the boat hull and the trailer rails when making adjustments to bunks or rollers. It only takes one mistake to crush your body and kill you almost instantly!