Originally Posted by Cornpop
Has anyone added carpet and sound deadening to the driver's cab I've got a 22 Seneca 37k and I really want to sound deaden the doors and add carpet to the cab also does anybody have ideas to stop the large mirrors from shaking so much
Luckily my 2014 came from Jayco with a carpeted cab. I think they went away in 2018.5 with the S2RV chassis.
In regards to your mirror question, our mirrors are made by Lang Mekra and they do (or did) offer a reinforcing arm that attaches to the upper bar and then bolts to the top of the door frame. So it requires the drilling of the top of the door and the installation of two rivnuts and then it clamps to the upper bracket. But you do lose the ability of the mirrors to "fold in" if they hit something.
The reinforcing bar is Lang Mekra 614100006. It fits either the right or left. I will attach a link to the manual for our mirrors, it might help you understand what these are.