Superior RideEFFEX helper springs
 

has anybody used any of these. Products

I am not trying to lift or lower I just want to help the blazer stay level when we go on trips and not sink down so much in the rear. basically I will haul about 500 to 600 lbs. in the back on trips, and the old springs have 132,000 miles on them and they seem to need a little help. and not ready to throw 200 to 300 dollars at new springs.

either get the add-a-leaf helper spring, or get new springs, best options.

^^^ I agree

where would you recommend to get a add-a-left from?