Update: So, an update as to what I have done. 1st attempt was a tire/wheel/springs/hanger upgrade. I went with new wheels and tires. Went up to "D" range tires and 15 inch rims. Still on 5 lug wheels. I upgraded to 2550# springs and Dexter's heavy duty equalizer kit. That went well except that I actually had a bent axle. My passenger side front tires was out a little at the bottom and pulled in on the top. I thought it was something wrong with my install, but no....the axle was bent. I have now purchased 2 new 3500# axles and installed them. Everything looks straight now. We'll see. The only thing I can think is that when I had my blowout last summer, the sudden drop was too much for the remaining axle and it bent it. It's was the axle that didn't blow a tire. Anyone ever seen that before? Again, trailer weighs 6400# on the 2 axles.
Thoughts?