I have a 2014 Southwind and decided to change the carpet and line the floor and dog house wth Sound and Heat Insulation at the same time.
I ordered the product through Amazon, an "Amazon Basic" product 12"x12" sticky pads, and placed 2 layers on the floor and 3 layers on the underside of the dog house, cost was under $100.
I checked the decibel levels before and after the installation and it reduced the db's by 10% and a significant reduction in heat transfer.
A relatively simple DIY project with very favourable results.