2009 Toyota Sienna Owners Manual - Page 258

2-5. Driving information n Trailer tongue load The trailer cargo load should be distributed so that the tongue load is 9 to 11% for weight carrying hitch or 15% for weight distributing hitch of the total trailer weight, not exceeding the maximum load of the following. (Tongue load / Total trailer weight x 100 = 9 to 11% or 15%) Without towing package: 120 lb. (54 kg) With towing package: 350 lb. (158 kg) The total trailer weight and tongue load can be measured with platform scales found at highway weighing stations, building supply companies, trucking companies, junk yards, etc. Total trailer weight Tongue load Towing a trailer Contact your Toyota dealer for further information about additional requirements such as a towing kit, etc. 230