Sorry you are having problems.
If you believe you are covered by warranty (one you purchased) you should contact them first. At least you know you purchased something and have a policy.
Whether they cover anything remains to be seen.
I'm not sure you should get your hopes up that you (the now 2nd owner) should be grandfathered into some other chassis warranty coverage. Most chassis warranties that carry-over, cover emissions and the related items. Powertrain/drivetrain warranties can sometimes be transferred but not usually.
If you visit a chassis dealer, the first thing they are going to ask for is maintenance records. How often were the tires rotated, etc.,etc. Hopefully you (and the original owner) kept up with and documented those things.
Best of luck with your outcome.
2016 Flagstaff 8529IKBS Diamond Package 5th Wheel
Ford F-Series SCREW 4x4
TST Tire Monitor - Sinemate 3500w Gen.
2016 Nights Camped = 42