Diesel Dog, why don't you buy the Optimas at Sears? They sell them there now & will stand behind them in the event of a problem, especially if you kick & scream enough! :-laf I'm an ex-auto center employee there & know what works for the customers.
I wouldn't be worried if they can handle the loads of a CTD, I'd be more concerned about the corrosion problems from regular wet cell batteries ( cruise control problems, grid heater relay problems, ect. ).
I presently have 2 Sears Trailhandlers in my CTD, and just went through the grid heater relay problem, caused from wet cell battery corrosion. My battery top is clean, with a little white powder starting to show (before the relay change, none now). I didn't think there would be a problem if I kept everything clean, which I did. I don't think I would have had the corrosion problems if I had the optima's in the first place.