My stereo shop did the floor and firewall in addition to the doors. We are now able to converse in normal speaking voice while underway at freeway speeds.
The cab install revealed other sources of noise throughout the coach. Of all the sources, the slide is the most problematic. Facing the vehicle on driver/slide side, one notices a gap in the lower front corner. This gap, in the leading edge of the air flow, can create a loud air leak similar to opening a car door window a wee bit. We manage by careful slide maintenance and following operation guidelines - keep switch depressed a full 2 - 3 seconds after slide stops. One can fine tune the system by running the slide in and out 3 times which improves the motor synchronization and cut-off points. When the slide is fully closed, no air leak.
While there is a manual adjustment, the manual suggests this is a last resort. Further, I am reluctant to increase the shut-off tension. Despite precautions, on some occasions, the slide does not properly close. I go to a flat spot and run the slide reset procedure, works so far.
I am solidly in the anti-slide camp but the spouse won't go without a slide. Decisions, decisions,