Originally Posted by Bigtalljv
I think I am going with aluminum I-beam, tandem axle, single axle disk surge brakes. 7000 lbs capacity for a 4000lbs boat.
Make sure the empty trailer will sink, and not move with surge. The tires will try to float the back of the trailer. Floridians often bolt lead or steel to the back of aluminum trailers.
Full stainless brakes are another $500 or so, think I'll skip electric over hydraulic brakes.
Agreed on both counts. While not necessary, SS brakes would ease a lot of my headaches (and make it easier to carry my wallet.)
Electric over hydraulic, from what I've heard, doesn't play nice with salt water. A simple surge brake system works well for me. With your size, look for an electrically controlled override for backing up.
Your bunk design sounds about right. Alternatively, four long bunks with the inside supporting your bracket, and the outer supporting and balancing the remainder of the mass.
If you really want to get complicated, a set of rollers towards the front to ease roll-on/roll-off, and bunks at the back for a bit of traction.