4 Bolt Vs 10 Bolt Reese Rails

[nd12811]

I was wondering if anyone has had any experience with the 4 bolt rails for a 5th wheel. According to Reese the 4 bolt rails put the centerline of the hitch on the centerline of the axle, while the 10 bolt rails place the centerline of the hitch 2 1/4" forward of the rear axle. I know that the 10 bolt rails seem like a better idea (more bolts = lower chance of failure in theory), but with my truck (5.5' bed) the extra 2" of clearance gained sure would be nice. After all, the frame brackets are the same for both kits, so the 10 bolt design only has two extra bolts in the bracket, the others are simply bolted to the bed, thus they do not provide much additional strength. My though is that if I go with a bolt that can be mechanically locked (pinned) for the four bolt rails I would feel better about the chance of failure and gain additional clearance. Does anybody else have this setup/ran into a similar issue? Has anyone noticed a difference in the construction of either rail with regard to material thickness?