Welcome to the forum! Don't have a toy hauler, but in our rig we use reflective bubble insulation and one inch and one half inch foam insulation depending on where we are working. Doesn't seem like it should, but the bubble wrap makes a significant difference on cabinet walls and ceilings.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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