I have a 74 fj40 with york air, pwr steering and gm alternator and want to upgrade the battery setup. I'm running a winch. My problem is that the york and alt is on the pass side, so I don't have alot of room to mount dual batteries. Should I mount one on either side of the engine or just get one big battery( the big rig variety). What about two optima's, are they worth the money? Have any of you had any experiences with these batteries? And if I do, do the two battery set up, should I wire them in parallel or use a isolator, and if I should use a isolator, what should it be rated at for amps? I'm running a 9,000 Lb winch. Thanks, Pete