Well, just incase anyone out there is reading this, I thought that I would give my before and after review of using a Helwig sway bar on a Ford Ranger and a few installation tips.
Truck:
1997 Ford Ranger 7' box 4x4
Before:
I had Timbrens and extra leaf springs resulting in a ride quality near stock with the camper on. However, during cornering and/or windy conditions the camper would rock side-side making driving very uncomfortable!

So I researched some ways to improve the "swaying". Obviously the words "sway-bar" come to mind. I heard good reviews on the brand Helwig so I purchased a Helwig sway bar locally to minimize shipping times to Canada.
Installation:
Removal of the old sway bar is pretty straight forward. Jack the vehicle up, put the rear axle on jack stands, and remove the rear tires. The only problem that I encountered was removing the bolt on the drivers side frame rail. The gas tank was perfectly in the way. So I had to remove the gas tank skid plate put the gas tank on a couple jacks, and remove the two straps holding the gas tank to the truck. I was then able to roll the gas tank a couple inches towards the passenger side in order to get a socket inside the frame rail and remove the troublesome bolt.
The new sway bar installed below the axle (as opposed to above) which made it very easy to line up. I did have to remove the brake line clamps and slightly modify the bends in the line for the sway bar brackets to fit properly though. With the new sway bar in place, I losely installed the downcomers to the sway bar before torquing the sway bar to the axle. Everything was then tightened up ensuring I had adequate clearance from the axle and shocks.
After:
I drove out to my parents farm the other day and drove down highway/gravel to get there, in winds around 60km/h. Usually the truck would have been rocking in the wind, but instead I could just feel a force pushing the side of the truck (the truck stayed near level). When on twisty gravel roads, the truck felt comfortable to drive with very little rolling in the corners.
Final Result:
I picked the sway bar up for $220. This is easily worth the added safety feeling.
Also, keep in mind I have a camper that weighs <1100lbs, so results may vary.
Happy Camping!
also - I'll add some pic's to this post as soon as I get them online from my camera