Not that wikipedia is 100% reliable, but:
The fourth-generation 4Runner incorporated serious changes to the chassis and body of the vehicle, but was targeted at approximately the same demographics as the third generation. Based on the Land Cruiser Prado 120 series, the new 4Runner retained the same basic exterior styling themes, and was still marketed as a mid-size semi-luxury SUV with off-road capabilities. Available trims are currently the SR5, Sport Edition, and Limited models. An all-new LEV certified 4.0 L 1GR-FE V6 is standard, but for the first time, a V8 became available, the ULEV certified 4.7 L 2UZ-FE engine which produces 260 hp (194 kW) and 306 lb·ft (415 N·m) of torque. Towing capacity is 5000 pounds on V6 models and 7300 pounds on RWD V8 models (7000 pounds w/4WD).
I have a copy of the toyota towing guide for 2007 and it shows all 4runners ( including the V8 ) have a 5000lb towing capacity, except for the V8 with the Weight distributing hitch option which is rated for 7000lbs.
The 5000lb hitch is attached to the bumper, whereas the Weight Distributing version attaches to the frame rails as well.
You can download a copy of the 07 towing guide here: