Little history. 92 FJ. 180k miles...bought at 177k. Runs great have had no issues other than inner axle seals that I fixed. Did oil change with Wix filter and Rotella 15w40 oil last week. Anyway went to get a Suzuki Samurai Saturday eve. Pulling 18' steel floor car hauler. It actually did better than I expected. Put Samurai on it and it did ok till I got about 4 mi from home and got hot....in the red. Turned heat on and eased up on it and it went back to normal. Today same trailer with some scrap metal on it. Not sure how much....got warm and turned the heat on and it came back down but couldnt keep it down. Overflow bottle has very little in it. Rad fluid checked to be good to -10F and was full. Fan clutch feels great and appears new. No sounds, squeaks, leaks, etc. Any suggestions? We have put 3k miles on it with no trailer and had NO issue.