I've seen some folks complaining about the ride of these little trailers, and I haven't seen any leaf spring tips short of derating springs, so I thought I would throw out a couple of things I've learned over the years.
First, Tire pressure. Most folks fill trailer tires to the max rated value and that's what they always use. Well, the fact is, you can adjust the pressure to match the load.https://plus.google.com/photos/114867801377029987835/albums/5724969015102653937/5724969012806313154
This chart can help determine the correct pressure for your load. For example my tires are rated at 1360lbs @50PSI. Combined the capacity of the tires is over 2600 lbs. I'm carrying something closer to 1/2 that. While the chart doesn't go to 50 psi, I'm just going to use the relative numbers. If I start at about 1360 on the right hand side, I can drop about 20 lbs and be at about 800lb capacity per tire, which should also give me a smoother ride and better tire wear.
You can also determine proper tire pressure using this method http://www.youtube.com/watch?v=ojGsavK0Uwc WARNING there is some foul language in the video.
While I'm on tires, radials are much smoother riding than the bias ply tires that most of us got from HF, or where ever you got your tire.
Now, the other important thing to check is the bolts on your leaf springs and shackles. The shackles are intended to move during transit. Almost every time I've checked shackle bolts on a vehicle or trailer, they were so tight that the shackle couldn't move. when that happens your 2500lbs springs become 4500lbs springs. They way that you can check that you have movement, it to put a wrench on the head of the bolt going through the shackle, and turn it. If it won't rotate, then the spring it probably too tight. Loosen the nuts until you can turn the bolt with some effort. WARNING, be sure that you are using locknuts on the spring and shackle bolts. I prefer the nylock style nuts, but the nuts with the divots in them are also locknuts, but the cheapest variety.
Here are directions from a trailer mfg as reference http://www.cerka.ca/catalog/SUSMAINT.asp.
I hope this is new to some of you.
Tom