I hit 235 on my TFT gauge towing my toy hauler (was dry and weighed around 6500#) home from LA when I first bought it. This was going up the grapevine in southern cali in 95* heat with 3.73s on 35" tires. I've since upgraded to 4.56s and haven't seen it go about 208 (and now when I tow it's loaded and closer to 8000#) . I purchased a Troyer trans cooler but I'm having a hard time figuring out how to mount and plumb it
I'm sure it will help even more
I have the Troyer dual e-fan and they have kept my ECT to 208 max, so they seem to help a LOT when towing. If anyone is having engine temp problems I highly recommend them or a similar setup. The wiring is daunting which is the only downside to them. I build custom in-home movie theaters and it even gave me a few head scratching moments.
Also, if you're running a constant 200* TFT, that seems a little on the high side. Even with just my stock cooler I'm usually between 165 and 180 during average interstate towing.