Since you have a 3,500 lbs axle, I recommend the 4-Leaf Double-Eye Spring for 4,000-lb Trailer Axles item # e22YR. These are for 4,000 lbs axles which will still work great with your Gulf Stream trailer.
As far as your 26" measurement goes. If this was taken with both sides of your trailer on the ground you'll want to jack up one side and remeasure the lifted side. The springs tend to stretch out over time and this will give you the most accurate measurement to go off of.
If your 26"... view full answer...
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