Climbing steep grades...

Thanks guys, this is all very helpful. What it tells me is that I should bring it back to my mechanic and see if there’s anything that he can do, equipment-wise. The reason I am thinking this way is because this MH routinely goes above 225 when going up hills, and that’s when it’s empty. No water, gear, toad or wife. The heat seems to always be something I have my eye on and it’s disconcerting. If the mechanic can install a trans cooler and maybe double check the whole cooling system to see if he can make it more efficient/effective, that might make the difference.