This thread is 4 years old..........
But as someone who's lowered 5/9, I can tell you that while towing your bumpstops will be on the axle unless you put bags in it. I have McGaughy's bags for flipped trucks in mine and have had 2200lbs in the bed before.
You're not going to get a 4WD lowered 5/7.
Yes I'm new to the forum I didn't even notice I honestly wanna do like a 4/6 and put the bags on the rear I have a 24ft trailer to hall my race car