Howdy! It's been a while and I was thinking of you and this forum recently so decided to pop in and day hi!
One of the things I was thinking about was the clearance issue on 2919 F350s and the like and AF990s. I had had ample time now to test out using just two mats and despite some harrowing 'off road' driving I have. ot crushed the sat shark fin or damaged the camper skin!
I removed the 1" foam board a year or two ago and haven't looked back.
In an up coming video you will see some visious rocking but no damage! woot!
We had this setup now since, we'll July 2919 (before that a 2010 F350) and still love it!
2019 F350 Lariat FX4 DRW PS6.7
2019 AF990