Re: rod holder install
What type of rod holders are you planning to install, what type of fishing are you doing?
I have 8 bases installed down the gunwales of my Superhawk 1800, so we can place the rod holder where they are needed. I'm using DriftMaster hod holders that have proven to be very strong, where I (or fish) have broken plastic/composite rod holders before. The only down side to the Driftmasters is they use a threaded bolt for attachment and right hand thread rod holder on the port side will loosen when a big fish hits while trolling,,, unless you nut the rod holder from the bottom. I have access to the underside of my gunwales and nut the port side rod holders from the underside. They also have left hand threaded rod holders to solve the problem on the port side loosening.
There are other brands available, but I liked the Driftmasters the best as they leave little attached to the boat when the rod holder is removed. Here's a pic of how I have the bases mounted, I'm using one of them to anchor the back of my bimini...