If the pads are replacement pads then you might have the incorrect material. There is a difference and Geno's carries different brands for that reason. I put the Hawk brand pads on and have not had a problem on my 2004.5 but I am not towing as heavy as your are. But I was getting brake chatter and squeal off the original Mopar front pads and changed for that reason. Then I found that the Hawk pads were slightly larger and the rotor was cutting a groove in the pad, causing squeaking. Filed that off and they are fine.