Why Would Anyone Choose Above Bed Fifth Wheel Rails?

Those are basically the reasons I went with ISRs. Cost less, easy install and it offered lots of flexibility for rail mount hitches and the drop in gooseneck plates. It hasn't bothered me having them in there and they make handy tie down points for cargo.

I can't agree with mowermech on taking them in and out. Some of the bolts on my installation aren't easy to get to at all and they're torqued spec which was pretty **** tight.