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.