I use this....http://www.westsidewholesale.com/ref...st1605003.html
I picked up some where they were insulating a new metal building as scraps.
I used one side sticky velcro on each corner and the other side Velcro I stuck to roof. Now I just go on roof and Velcro down when needed. Make sure to remove before driving. I also have a piece over my sunlight over the dining table in the slideout.
2015 338RETS Eagle Premier gloss sides., king.
2012 Ram 3500, crew cab 4x4 duelly Deleted
16k miles, 530HP, 1000 +torque.