Hi Tom, many here will think it is overkill, but I purchased a "Hensley" style hitch for my car hauler (24-foot box / 27-feet overall) which weighs in at about 6K lbs total. I tow with my Jeep Grand Cherokee W/Hemi and I feel so much better having this setup. I hauled my trailer from NH to VA to Pittsburg for the SAAC event a few years ago and had absolutely no issues. The few times I hauled this trailer without this hitch, it was not so great. I ended up going with the Propride version and never looked back. If I had a heavier pick-up with a longer wheelbase and wider track, I probably would not have purchased it. These two videos do a great job of showing the principle:
https://www.youtube.com/watch?v=YDER3up7I_s
https://www.youtube.com/watch?v=o1MZoskr46Q