I don't know the particular setup for the 2011 tracker 175, but I had a 2011 Pro165, in which I had four (4) batteries in the battery/gas tank compartment.
I removed the starter battery, then placed an interstate trolling battery, which was placed at the starboard side of the compartment, next went in two batteries, one which was used for the trolling motor ( I was using a 12 Volt motor and a switch to change batteries) Next battery was a extra for accessories (night lites for after dark fishing) then the starting battery was installed in it's proper place.
YES things was tight, but it all fit.