We recommend using a weight distribution system when the trailer weighs 50 percent or more of the vehicle weight or if the rear of the vehicle is sagging. I have included a link to our FAQ article on weight distribution for you to view for more info.
If you determine that weight distribution is needed you will need to go by the loaded tongue weight of the trailer. You can calculate the loaded tongue weight by combining the tongue weight of the trailer when loaded and ready to tow plus... view full answer...