I thought I would post this for Barbie and anyone else that tows a trailer, thinking about towing a trailer, or thinking about getting rid of their trailer because the hitch is too heavy.
I used to have a traditional weight distribution hitch but the hitch head was just to heavy for me to lift anymore. So, I bought this 2 years ago: http://www.andersenhitches.com/catalog/andersen-nosway-weight-distribution-hitch.aspx
The entire unit, chains and brackets included, weighs about 65 lbs (and the only time you have to lift the entire unit together is when you buy it). The hitch is amazing. I have very little to no sway when towing. The only negative I've ever read about with this hitch is that if you have a large trailer with a very heavy hitch weight, it doesn't always move enough weight back to the front axle of the tow vehicle. I have a more than capable tow vehicle and a trailer with a fairly light hitch weight (under 800 lbs), so I don't have to worry about that.
Towing with this hitch is night and day compared to a traditional hitch. It is so easy to hook up and it has more opportunity for fine tuning the distribution than traditional hitches. The only thing I had to do was have the brackets welded to the A-frame of my trailer so they wouldn't slide. The best part of this hitch is there is NO GREASE! None. None on my hands. None on my clothes. None in the storage area. None! The link has 2 videos I think that explains how it works and how you connect it.
This hitch is not for every application, but it works very well with my trailer (under 7000 lbs) and my F150 truck. So, if someone had a smaller tow vehicle and a smaller trailer, it should work the same.
I have 2 years of experience using it and have not had a white knuckle towing experience yet. I barely feel cross winds now and I don't get whipped around by trucks. The sway has been almost completely eliminated in my set up.
Barbie, I know you've had issues with your shoulder so thought I would share this to give you an alternative to a traditional (heavy) weight distribution hitch that you might not be able to lift easily.
Laura