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The reason that I stated plug weld instead of bolts is that I have found that bolts would tend to walk (stretch a bit) a bit due to the stress and torque on the rail, even grade 8, once the bolts stretched the fish plate was no longer supporting the stress from the repair/mod which in turn =...

The 12x6 fish plate will do little to prevent the stress from doing what it wants, it is NOT the load but simple rail movement, load does not help, there is a tremendous amount of stress/strain on the rails just going down the road let a lone off road, add any kind of load, things get worst...

From someone who done MANY frame repairs and mods, I would fish plate both the inside/outside of the rails, the longer the better, 6' with 3' on each side of the weld, if you can not get to the inside, go thicker on the outside, at least 1/2", the ends of the fish plate must be at a 45 deg. NOT...