You need to weigh the trailer on a CAT scale. No amount of guessing at weights will tell you what you need to know.
Weight adds up really fast!
And I really doubt your axles got bent sitting in a campground. As mentioned above you would have had your jacks down and even 1500lbs static load is probably less stress than 600lbs load bouncing around going down the highway and over bumps.
Hopefully your warranty covers you. Although it might not if the dealer thinks you overloaded the trailer.
2014 Jayco Swift 281BHS
2015 F250 XLT 4x4 Crew Cab, Short box, 6.2 gas
Solar powered! The trailer not the truck!