Suspension Enhancement to Reduce Sag on 2018 Toyota Tundra with Boat Trailer Attached  

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Expert Reply:

The best type of rear suspension enhancement for your truck in terms of trying to maintain a level setup with the trailer connected is with an air bag system that will let you adjust the air pressure based on load. For your 2018 Toyota Tundra 4x4 I specifically recommend Firestone Ride-Rite Air Helper Springs # F2445.

These heavy-duty air bags include custom brackets made for your truck which eliminate the need for any drilling. The bags can be adjusted from 5 psi to 100 psi so when it's time to head to the lake you can add air to better support the trailer and when it's time to head to work on Monday you can let some out to maintain a smooth ride.

I have attached the complete written installation instructions that you can look through to see if it's something you're comfortable performing. An install video on the 2017 Tundra has also been attached that you can use for reference.

Now there are rear suspension products available that offer an easier install process, such as jounce-style springs like the Timbren # TTORTUN4, but they aren't going to do the best job of keeping your truck level with the trailer attached. This is because they basically act as upgraded bump stops that would still need to be engaged (the truck would still need to sag before making contact with them). Air bags on the other hand can be inflated to better fill this gap.

You also mentioned already having a load-leveling system installed. If you are getting a substantial amount of drop at the rear with this system in place you might also check to make sure that everything is properly adjusted and that the system is appropriately rated. It's important to keep in mind that a correctly rated weight distribution system is one that matches your setup's total tongue weight.

Total tongue weight includes the loaded tongue weight of the trailer along with any added cargo you might have behind the rear axle of your Tundra. Make sure the tongue weight capacity range of your system matches this number. If you can let me know what model system you have I would be happy to verify its capacity for you.

expert reply by: Chris R

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