I dont think the trailer is the issue,its what your going to be hauling,but yes you can over do it with the trailer.Depending on the drive system and size of you ATV bad things can happen...I have a Sportsman 4 and 500 that I use to pull my Ranger bass boat around and Pontune.Its deffenetly(spl) to much weight but I do it anyway.I did buy a Polaris Ranger afew year ago so I dont use the sportsman's any more for pulling thostrailers around.
Forgot..I still pull a 16' single axel trailer around lightly loaded with odd and end stuff with the sportsman....
I would stay within Mfg sugested towing while your warranty is still good.As you use your atv you will get to know what and whatnot you can do as far as trailers go...
A single snowmobile trailer is a good trailer also,just put sides on it.