I have a 2018 passport 2520 RL when I added additional battery I had use a saws-all and cut the side angle irons off . Then I was able to mount 2 group 27 battery boxes .
I would make sure you get group 27 boxes. Walmart’s in their store stock an adjustable battery box that works for a 24,27 or 31 battery they are way to big unless you are using group 31 battery’s .
Just my thoughts
Pat and Debbie
Dearborn Michigan
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