I recommend the Blue Ox TrackPro Weight Distribution System part # BLU87FR which is rated for 10,000 lbs over the Blue Ox TrackPro Weight Distribution System part # BLU67FR rated at 8,000 lbs for a 7,000 lb trailer. It's a good idea to select a weight distribution system that is slightly over the tongue weight of the trailer or what you think you need. This is because most people often underestimate their tongue weight and having more capacity giving you more room for error or simply more... view full answer...