Set the fan speed on high except in very humid weather. When it's humid, set the fan speed on low. You'll get better cooling, and slower air movement through the cooling equipment allows it to remove more moisture from the air, resulting in greater comfort.
When hooking up a trailer, instead of connecting the trailer’s safety chains directly to the hook in front of it on the vehicle, cross them. Put the chain from the right side of the tongue to the hook on the left side of the hitch. Likewise, put the other chain onto the hook on the right side of the hitch. That way, should the trailer come unhitched, the tongue and coupler will land on the crossed chains instead of skidding on the road.