i run a small tranny cooler on mine and use the extended filler neck hose trick. I have a WTO hydro assist. Even with a good amount of rock action, my steering resevoir never seems to boil over. Thats a good thing. When I upgrade my big tranny cooler to an even bigger stacked plate cooler Im gonna put the big one in the PS loop. IMO, you can't have too much cooling when it comes to the PS system. Just by its nature it can generate a LOT of heat and do so very quickly.
j