Before you cut, look and see if the membrane on the bottom of your rig is secured on the outer edges with a metal strip and screws. If it is, you should be able to take some screws out and get at the valve and then put the membrane back up.
2013 Ford f150 Eco Boost 3.73-max tow-max pay- tuxedo black
Reese Select 16K
135 Watt Kyocera Solar Panel
25 Amp Go Power Regulator
"Wilderness is not a luxury but a necessity of the human spirit."