Thanks for the input. I'll probably go with the cheaper cooler. I'm still iffy about that power steering cooler though.
I pull a Bigfoot
17 with an 03 Odyssey. The PS cooler is mandatory, according to Honda, for the following reason:
when towing, usually, the revs are higher since you are mostly in 4th or 3rd gear - rarely in overdrive lock. The power steering pump vents it's overpressure normally, but the temperature will increase with the rpms. Without extra cooling, the fluid will exceed nominal temps and break down quicker! A bad thing!
On my recent trip to Dayton, I was pushing a severe headwind most of the day getting only 100 km with 25 l of fuel (9.5 mpg US)! The engine revs were sitting at around 3800 rpm for long periods of time! I'll bet that the systems were getting pretty warm! I was glad to know that I did have both extra sized coolers for the tranny and PS.
Return trip gave me 100 km with 18 l (13.3 mpg US, more normal!). Not towing, I get over 22 mpg US!