Welcome to the forum.
Fleetwood has used the Sony XAV series in other applications so based on what I'm seeing described in the 2021 Fleetwood Bounder brochure and the image I see from random photos online, I'm going to guess it's the Sony XAV-AX8000.
Sony 8.95" Media Receiver with Bluetooth® XAV-AX8000
It's only a guess but what I might do is ask the moderator to move this thread to the Fleetwood Owner's Forum and maybe somebody who has a 2021 Bounder can confirm my guess for sure.
Here's what is described in the 2021 Bounder brochure:
Sony 9” Stereo w/AM/FM/Bluetooth®/ MP3/USB, Phone Control, Android® Auto and Apple® CarPlay® w/Navigation, Siri® Eyes Free, Built-In HD Radio, SiriusXM® Ready (Requires Subscription), and Backup Camera
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