Quote:
Originally Posted by old man jimmy
single wall bolt thru the top into the bed. Double walls bolt thru the bed into the top. And singles have a dome light. I think doubles look a little cleaner, but much harder to take off. The bolts are under the side panels. Started singles in 72, but used up all their doubles first. So many 72's had single.
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Actually, it's the exact opposite. Single walls bold down through the top of the bed. There are threaded inserts in the bed rails. If you have interior panels, it makes them easier to remove.
double wall tops show more sag and can have a tendency to split at the seam. Dobule walls are also heavier, but I don't know if there is really enough weight difference to really notice since they are both heavy and awkward to handle.