Thanks Mar-Ktech. This is very valuable information to me. I currently have some old improperly mounted boards in the bed. I will assume without checking, that it means I already have the clearance you described. The cross sills are part of the bed and not part of the frame, correct? Would you be willing to provide me with the measurment between sills? Then I know for sure what to order.
Aloha,
Rich
