Kycamper, Yes I used two long screws to mount the fan. I drilled through to the other side which is the in side of a cabinet the wall cavity is hollow.
I used a couple of large washers one for each side,screwed a nut on the screw just about 3/8th on an inch from the head of the screw. and a lock nut and
washer on the other side in the cabinet, I tightened the nut to lock the screw in place. the fan hangs on the head of the screw. The fan is removeable when we travel. Installed when we get where we are going. This is the only photo I have of the screws which I will paint to camouflage them
2016 Ford F-250 Lariat 6.7L V8 Diesel
2013 Jayco Whitehawk 26DSRB