I put 140,000 miles of towing (for work and play) on my '08 Highlander. I sold it with 185K total on the odometer. By that time the transmission temp light would come on sometimes when climbing long grades at higher elevation (Rockies). I was happy with it up until then. Good power in most situations, although climbing while in a strong headwind would cause me to slow down to 38-40 mph and use a lower gear. I did have a 16'L x 7'W x 99"H KZ travel trailer for about 3 years, 2700 lbs total and about 375 lbs (loaded) on the hitch. And I used the Andersen hitch, mainly to reduce the humping over the expansion joints and to smooth out the ride; it was pretty nice to use compared to my old Equal-i-zer.
Now I have a '08 Lexus GX470 with 4.7L V8. The thing I like best about it is the air suspension, which stiffens the rear and keeps it level even with trailer attached.
