It depends on what kind of rod holders you are going to use (assuming Monster style) and exactly where/how you mount the bases but in general, more bolts are better.
Nyloc nuts are a must either way. If it were me I’d want the top and bottom skins of the rail tied together with bolts and sleeves.I had thought of that. Not sleeving, but using nylock nuts and not over tightening. Is it common to trust top layer alone? Rivnut?
Yes sir, those are the two I was considering. Didn’t know if there were a particular advantage to the triangular ones. I get it that an extra screw can’t hurt.Are you thinking of using one of these plates?
Amazon.com: attwood 5072-7 Sure-Grip Rod Holder Mounting Base — Flat Rail Base, Fits Square Rail, Pre-Drilled, Extruded Aluminum : Sports & Outdoors
Amazon.com: attwood 5071-3 Sure-Grip Rod Holder Mounting Base — Flush Base, Fits 2-in. Flat Surfaces, Pre-Drilled, Extruded Aluminum : Sports & Outdoors
It takes a lot of pressure to seat the rivet nuts I use straight oneSo a rivnut through the top layer alone would be stronger than a bolt running through top and bottom? Also, what rivnut tool do y’all prefer? They offer the angled type, which I’m considering, and the long, straight type. Seems the angled would offer more access in confined areas.