Put Gatorbak's on my 2019 Z19 single axle trailer today and am impressed! Super easy to load - no power-loading needed...at least on the ramp I used today. Maybe steeper ramps will require a little, but surely not much. I always keep my bow strap hooked up until I'm in the water, so obviously no difference there. The thickness and quality of the Gatorbak's is what surprises me the most. I can definitely tell these will last many years...more than likely longer than the treated 2x4's.
I went ahead and rounded off the top edges of the 2x4's. The design of the hull (NVT) looked like it required it and it really didn't take that long. Table saw and belt sander is all it took.
The product number of Gatorbak that I went with was GBRE350 - I highly advise getting the kit and not just the covers. They sent more than enough SS screws and the end caps look really nice. Also - mention that you are a BBC member and you'll get a 10% discount!!
Hope this helps if you're interested in upgrading your trailer bunks.
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