I just installed ~$300 (at cost) worth of suspension parts on my trailer. I made sure to get a galvanized axle just for insurance, after seeing what brackish water did to the last one. Hopefully the place in Newburg has a rollback or at least access to one. Good luck!
I invested a ton of $ in my slingshot trailer, and it wasn't even rusty!!! New axles and swing arms, replaced the entire electric brake assembly, storage locker, updated electrics, lights and wiring, customized tie downs, new wheels and rubber, even had the steel deck coated with Line-X.
The previous owner abused it terribly, the wrong wheels, axles bent from total overload....
Oh yeah, and a custom winch and winch stand that gilligan made for me.