New to site, anyone have Coachman RV advise to share?

[Wemustrv]

Wondering if any other Crosstrail owners on the Forum have enhanced the insulation on their Coach and willing to share tips.
The stairway into the coach as well as the wheel wells are 1/16th steel, and completely non insulated. These are major sound sources as well as major thermal transfer conduit.
As well the B Pillar seems lightly insulated.
Any shared experiences/suggestions Most welcome before i delve in before winter.
I've already insulated the battery bay ( I've 2 x 400amp Renogy Li Batts.) with 1.5 inch high density closed cell foam
Thanx.

We have not added any additional insulation. We do close the stair cover and place a throw rug over it making sure it is against the door when it is cold out. This stops a lot of cold air from entering. We have an older 2007 Encore. I am not sure if your unit is the same in the stair area.