I just redid the bunks on my Ranger 2014 z521c and noticed the boat sits in the center bunks and makes contact only on the port 6 ft bunk there is a 3/8 gap on the starboard side and its not the way the boat is loaded its on most Ranger trailers just nobody notices, I have checked with carpeted bunks and with plain 2x6 don't matter I was told just the center bunks support the boat and the outer ones are just for a guide, I have never had a boat that doesn't sit on all bunks for support, trust and believe its true and I not the first to figure this out, its just not talked about much I have measured the wood and explored every scenario, its just the way it is and when you have carpet its thick and soft so you wont notice it but its there, shimming the bunk boards corrected the issue for me. that's the hull truth.