I am also a fan of the Atwood with the heat pump. Extremely quiet. And if you put it on auto, it will cycle through the 3 speeds until it reaches its
programmed temperature. or set it to low, mid, or high and let it do its thing. When the compressor kicks off, the inside fan stays on. So you will
have the same inside ambient noise level.
But it is full size, If outside drag while driving concerns you. One Atwood 15k should be plenty for a 23 foot GMC.
Scott.
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Scott Nutter
1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, tankless water heater, everything Lenzi. Alex Ferrera
installed MSD Atomic EFI
Houston, Texas