As I look toward a new camping season I've started thinking about the underwhelming performance my 1990 HDJ81 has towing my 21ft aerodynamic 3000lbs travel trailer. I used to tow this trailer with my '99 4 Runner V6, and to be honest I wish my new old rig could do as well with it. It has 33" tires, stock exhaust, the largest tranny cooler I could get, new fluids, and recent tune up. The power delivery is fine...though I'm going slower now and watch my RPM's a lot closer than I did in my 4R. My biggest problem is with the tranny temp. Going no faster than 80 or 90 km/h, easing it up to speed to get the tranny locked (over 60km/h I think), I regularly get the tranny overheat light coming on going up hills. I have to pull over and cool down before I even attempt anything big. This is driving on routes like hwy 97 from the Okanagan Valley to Prince George (BC), where there are a few hills, but no epic passes like the Coquihalla. I went to a tranny shop and they smelled my oil, and I haven't burnt it, but it makes me a little nervous, and discouraged to really use it for any major trips. It seems on this forum, people are towing all sorts of things with their rigs and little reference to this problem. The truck is great otherwise...I love it. Any suggestions?