tldr: Can I run a pair of 6v golf cart batteries without a battery box strapped right to the rails?

Long version: My existing 12v deep cycle interstate battery has been failing so I decided it was time to replace them. After much debate, I decided on a pair of 6v golf cart batteries and a Torxlift PowerArmor box.

The only problem is the PowerArmor box won't be here in time for my next trip. So my question is, could I just wire up my two 6v batteries, strap them right to the rails on the tongue of the trailer and call it "good enough for a short trip", hope they don't get stolen, (Planning a 5-day boondock) then install the box when I get home. There is no chance of inclement weather for this trip.

What do you think folks? Safe?

Thanks!

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2020 RAM 2500 Diesel
2018 Grand Design 2800bh