Video by Transwest call them 877-772-9995 ask for the cover wrench. The link I sent is basically the same but would need a screw driver through the holes as a handle. Most of those caps I have dealt with wouldn't need a handle, just a tight grip on the tool.
2000 F250SD SRW 7.3 Long Bed Extended Cab Air Bags
2014 Eagle 30.5BHLT
2007 Layton 245LF (sold)
196? Shasta 16ft
Learn from others mistakes, you'll never live long enough to make them all yourself.