2020 Keystone Hideout. Safe to unhook battery? full timers

With a quality converter, your batteries won’t overcharge. What converter do you have?

Battery should not overcharge provided your converter is functioning properly.

2020 vintage trailer should have a decent 'smart' converter/charger

Smell from electrical panel needs investigated
Check that ALL terminal screws inside the panel are TIGHT
From the CBs, at the ground bar, at the Neutral bar, at the DC Cable lugs on fuse panel
Look for ANY burnt signs....melted insulation

Electrical smell means loose connections or melted insulation which can end up arcing/burning---FIRE

Did the furnace work after you replaced the thermostat?

K Charles wrote:
Did the furnace work after you replaced the thermostat?

I never checked it do to it being blazing hot last night.

What oldbiscuit said.

Of course you can unhook them. Are you asking if it’s ok to unhook or ok to run the trailer without batteries?
Be more specific in your questions.
BTW, you need a battery because that’s how the camper is designed. Even if plugged in, many of the systems are DC current.
Can’t help with the electrical smell. Nothing you did would have changed an existing condition.

I have a heat detection laser guided gun, everything & I mean everything in the breaker box was 82 degrees EXCEPT the a/c breaker which was 92 degrees keep in mind the a/c has been running most of the day due to it being almost 90 degrees here in Texas. I called a certified electrician he said it could possibly be doing that because the trailer is a 2020 & has been set up for less than 3 weeks it could just be a 'new' smell.

Anyone know where the converter might be on this hideout 338?

It's probably integrated into the back of the fuse and breaker panel.