2010 Subaru Forester Owner's Manual - Page 270

8-20 Driving tips ! Tongue load Tongue load 1) 2) Jack Bathroom scale F: Front of vehicle Ensure that the trailer tongue load is from 8 to 11 percent of the total trailer weight and does not exceed the maximum value of 200 lbs (90 kg). The tongue load can be weighed with a bathroom scale as shown in the illustration above. When weighing the tongue load, be sure to position the towing coupler at the height at which it would be during actual towing, using a jack as shown. The tongue load can be adjusted by proper distribution of the load in the trailer. Never load the trailer with more weight in the back than in the front; approximately 60 percent of the trailer load should be in the front and approximately 40 percent in the rear. Also, distribute the load as evenly as possible on both the left and right sides. Be sure that all cargo is firmly secured to prevent a change in weight distribution while driving. WARNING If the trailer is loaded with more weight in the back of trailer's axle than in the front, the load is taken off