Air Bags in rear springs

Does anyone have air bags in their rear springs from Air Lift or Firestone to improve rear sag while hauling heavy loads or towing trailers? If so, which do you recommend. Would you go with a better spring vs OEM springs and if so, which one would you recommend. Thanks!

 

I have the firestone coil rite airbags. We tow about 5000 lbs when fully loaded with 450 lb tongue weight on a double axle trailer with brakes. (Boat). Install was not hard, they have been reliable. With load we air up to 35 PSI. We do not get flashed for high headlights when towing in the dark. (We did not re aim the lights).

With a boat on a double axle trailer, tongue weight recommendation was 8% of full load. 9% has worked great for us through nearly 10 years and 2 4Runners.