Bent Axle on my Extreme trailer

Just thought I would jump on here and get some advise from all of you. I have a 2003 Malibu Wakesetter VLX and In the past 2 years I have had about 3 blowouts on the same side on my trailer (some new tires even). Dual axle trailer and the tire that blows out is the second axle on the star bird side. The last blowout was quite bad, the tread got stuck up in the wheel fender, shredding the fender and light system.

The report back from the repair shop was that I have a bent axle. I am trying to figure out if one or all of these things contributed to my problem:

1. When I pull in my garage to park my boat I have to basically turn at a 33 degree angle to fit my boat in the garage. Sometimes the wheels squeal to get the proper angle.

2. The crappy roads in CA with potholes. I try avoiding them as best as possible....

3. When we go camping I load up the boat with H2O, beer, camping chairs, and all the gear. I also load up the Tahoe but what doesn't fit in the Tahoe goes in the boat.

4. Maybe the original blowout caused the axle to bend?

I am the original owner and have had no issues for 10 years. Now the stupid insurance company is threatening to "salvage" my trailer because I only have it insured for $2500 and the cost of repairs are more than they are willing to fix.

So my questions are: What happens to a salvaged title on a trailer? And am I doing something wrong to get the blowouts all of the sudden.

Thanks everyone!