Hank85713 wrote:
Biggest thing they ADD capability to keeping it level and then that helps keep the trailer level and as a result may improve the areodynamics of the load since high front end causes more air resistance (?) low front on trailer increases resistance from the trailer (?).
If you are sagging so much it affects the aerodynamics, you are grossly overloaded.
First thing is to take it down to the local CAT scale and see what the real weights are. At the very least give us the specs on the truck and trailer, to give an idea if it sounds like a reasonable combination.
Swaying usually implies the trailer weight distribution is off and airbags aren't going to solve that.
Airbags can help if you are marginal but grossly overloaded, it's not going to solve the issue.