You will cut your available battery capacity by 1/3. If you don't dry camp you are probably better off not lugging the extra weight around. Just reset your charger to the battery bank size you would have and enjoy.
I was considering pulling 6 batteries out of mine for my golf cart. leaving 2 in the MH while I am parked for the winter. Then replace all 8 with AGM's when I start traveling in the spring. I should get 2-3 season of use out of them in my golf cart.
Wayne & Kathy
05 Alpine 40FDQS #75330 Towing 24' car hauler, 2012 Spyder, 2003 Harley FatBoy