Looking at the Keystone website 3D walk thru it looks like you have the Summit TV and ceiling mounted speakers - correct? I cannot tell the brand of the receiver in the panel below the TV. Some things about RV TVs and sound systems....they're lowest bid junk.
I've not had a Summit TV but I had a Furrion in this trailer. It came out at purchase - it sounded horrible and probably much like you describe. I put in a Vizio. I wanted a Samsung but could not find one in our size that had 3 HDMI ports. I also changed the speakers to JBLs vs the junk that came OE. The ultimate solution was a Polk soundbar with wireless sub. I just pulled the TV out and placed the soundbar on the shelf lip directly behind the TV. It sits there all the time. For travel I just push the TV back against it, tighten the security strap and take off. Hasn't posed a problem of any kind in several thousand miles of roaming.
Edit: Just looked at a video of the trailer and it appears you have a very similar space behind the TV for a sound bar.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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