Jdb: Thought your mod was a great idea so we did the same in our 17 ACE. Took the DW and I about 4 hours to install and that includes removing the seats. Definitely recommend cutting a template and then laying the mat on the floor to cut. I used a pair of tin snips to cut around
the template and then cut the holes for the chair bolts with a utility knife. We used the 48X60 mat and although it didn’t go all the way across the cabin, we were able to use the cutout piece from the doghouse to fill in the gap. Mounted the chairs on top of the mat in hopes of reducing more of the road noise. Will be taking a fairly long trip soon and we anticipate that the noise level will be greatly reduced.