Adding sound/heat matting to the dog house and the underside of the floor under the seats will make a big difference.
For suspension improvements consider add changes incrementally. Make a change, such as the cheep fix then dive the couch for half a season or so. If you happy then go no further. If not try the next item on the list.
I don't have a climbing video but how about a 10% decent in second gear?
https://youtu.be/Yi8BKesrYUE
At about the 30 second mark the Navigator opens the windows and you an really hear the engine screaming. This is with sound matting on the engine cover.
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