Trailer springs , anything special on Rangertrail trailers ?

 Hey gang , just noticed I got a weak spring on one side of my Ranger Trail trailer  and the tire rubs fender just a hair and just wanted to ask if they use anything special. I have replaced quite a few trailer springs on my fleet trailers  at work and usually source them local,  but after changing my tongue Jack on this trailer and had to be a little fab work to make a aftermarket Jack fit the factory mounting pad, just wanted to get another opinion or if any of you had to replace springs on your Ranger Trailer . 

2004   180vs Reata boat  and single axle Ranger Trail trailer , this had leaf springs,  the previous owner told me he changed a spring at one point and I didn't realize until this spring that they didn't match at all, one side was way low compared to other side . But again you break a spring in the middle of nowhere,  you do what you gotta do to get home I guess. 

Is this an older Ranger trailer?  I thought Ranger trailers were Torsion axel's.

Just an update,  found a set of 4000 pound ( I m guessing) from the stash at Kendor Marine since Northern Equipement was out of 25 1/4  4000 pound springs and trailer is now sitting level , plenty of clearance between tires and fenders now. My right side had a cheap China made spring that was too weak and caused that side to ride low making tire rub the fender . Before changing your springs , always measure old spring OFF the trailer to see what you need length wise and width wise . And replace your hardware no sense in reusing bolts etc when you can buy a kit pretty cheaply as far as u bolts go .