Just installed a retrax pro MX cover which rolls up into a box at the cab. Comes with two drain lines for the box but not sure where to drain these too. Looking between the bed and the there are two plastic "oval caps" anyone know if these "knock-outs"? There are two raised sections in the bed that appear to align with these but the bed liner covers them so can't really tell. Can I create a hole to feed the lines - or is that a dumb idea?



