Owner Dan Cherry drove a Toyota Grand Highlander Hybrid Max Platinum 3,600 miles across several states, towing a 16-foot Airstreamⓘ weighing about 3,500 pounds. The route included mountain climbs and 106°F heat. Transmission fluid reached 230–240°F on steep grades and hit 248°F after parking, with no dashboard warnings. Engine and oil temperatures remained normal; brakes worked but smelled hot. The owner recommends monitoring ATF with an OBD scanner and more frequent fluid changes for regular towing.
