Wow...would you listen to all the replies to just add a band aid before finding the root cause of the problem! You dont just add sway control not knowing why your set up is swaying so bad! These devices are not to fix a poor set up, or mask another issue, especially on this size (and weight) trailer. What aweful advice.
#1 ***Get the camper weighed on a scale!
#2. THEN verify #270lbs on the tongue is 10% or more of that scale weight.
- You may very well need a little more weight on the tongue, but dont go crazy.
- Trailer nose angle can greatly help reduce sway and trailer control on single axle trailer. (should be level or slightly nose down)
- What PSI are you running in your trailer tires? If not max cold, try it.
- Is this an older camper? Have you had a shop look at tire/axle alignment?