Has anyone used this helper kit? http://www.amazon.com/Hellwig-550-Level-Helper-Spring/dp/B001UFRUWU/ref=au_pf_pfg_s?ie=UTF8&Model=Tacoma|1037&n=156841 81&s=automotive&Make=Toyota|76&Year=2007|2007&newC ar=1&carId=00
My '07 Regular Cab 4x4 sags pretty good with 400 lbs in it. I also hear it hitting the bump stops. I plan on towing a light trailer with an ATV and thought these may help. Thanks for any information.