i put 2 big rigs batteries in mine side by side just had to grind a little here and there

 

I've got two Optimas, a red and a yellow top.., the red is for the engine crankin' only and the yellow runs the accesories.., like a 1500 Watt stereo, the 15000Klb Warn winch and extra tranny cooler fan.., ect.., the ol' girl cranks right up everytime..., and if I've left the stereo on by mistake.., the yellow top recahrges in no time from dead to alive...