I posted this in the transport area and didn't get much of a response. Hoping some of you have experiance in this area and can help. Have 2004 dodge dakota w/towing package ..rated 500/4500. Towing 16 ft trailer with 3500 brakes..weight right at 1000lbs....usually have about 2000lbs on it. My truck saggs just a bit. It's loaded correctly tounge weight right at 500..so its not just tounge heavy. I would like to correct this without greatly effecting the unloaded ride of the truck. Which product would/have you used.... "air springs/bags" or helper springs?