New tires rubbing on fenders

The offsets are different though they should work. Spacers or springs should solve it. Your just trying to dress it up.

Being its a 2004 model trailer, you may want to check the shackles on the leaf springs. The bolts, shackles and rocking beam all will get considerable wear causing the fenders to sit closer to the wheels.Also will cause the beam to hit the frame.I am well aware that the main issue is the wheel offset. But this may fix your problem if they are worn.

A better thought would be to check top of the axle to frame gap (clearance) and see how much travel is there? How high can the tire come up, as the frame stops axle travel. Then you know how much wear or even damage is there potentially? There is not doubt the springs are sunk or flattened some over time. Though most of todays springs have short life cycles than these old Steelcraft springs that were made in Miami, Oklahoma. Todays springs are almost all Chinese imports and not usually what older ones were in tension and tend to loose tension sooner. Still if there is a chance of excess contact you have little option other than shortening the shackles or blocking the springs and axle further from the frame.

Might be a dumb question but how high is your hitch point. Just wondering if lowering would put more wieght on the front axle and less on the rear.. Just a queston…? Else, I remember in the past there were spring shops who can re- arch a leaf.. They dont exist any more?