I have a 2011 Duranga, V6. It did not come with a towing package but I had a tow hitch put on for up to 7,500 lbs. Towing capacity for my Durango is 5,000lbs. Hooked up to a trailer that is almost 6,000 lbs and it wouldn't do it only over the drag. Would changing the shocks over resolve this issue or do I need to do more? We have been towing a little camper but our daughter has the 6,000 lb one and we would like to buy a new one for me and give her my old, but it can't be done if I can't up the towing capacity.