Weight distribution hitches can be a negative for small trailers. Generally they're not recommended for trailers under 5,000 lbs.
One has to remember that with WDH there's additional weight placed on the trailer axle
. It's pretty easy to overload the trailer axle
thus reducing the life.
Do a google search on "how weight distribution hitches work". What you want to read is NOT the WDH manufacturers stuff until after you're read some of the independent information.