Hi Dan,
Yes 4 x 8 hard foam board with foil front about 1" thick, used roofing nails with large aluminum washers. Did the ceiling years ago and still nice and tight.
Get a bag of oil dry sometimes called speedi-dry spread it on the floor, take a small piece of 2x4 wood and grind all the oil dry into the floor, sweep up and stains are gone. You may have to hit the heavy stains again.
Ramps are two pieces bolted together. I brought mine home from the trucking terminal in my half ton pickup with absolutely no problem. Just have to leave the tailgate down.