Hey man! Welcome to the Tremor club. To steer you straight on this, you're basically driving an F-350 in disguise—kind of like a Transformer. Here’s the breakdown to answer your questions:
1. Does it have F-350 suspension and axles?
You heard right! The Tremor package basically makes the F-250 and F-350 mechanically identical. Your F-250 Tremor is physically equipped with the F-350's heavy-duty rear axle, beefier leaf springs, and the extra overload spring that standard F-250s don't get.
2. Will it handle loads like an F-350 / better than a typical F-250?
Mechanically? Absolutely. Because you have the F-350 hardware underneath, your truck will physically manage bed payload and tow weights exactly like an F-350 Tremor would. It won't squat like a standard F-250, so you definitely have improved, real-world capability compared to a base F-250.
3. Can you change the GVWR payload sticker?
Here is the heavy truth: No. Once a truck rolls out of the factory and gets titled, the Gross Vehicle Weight Rating (GVWR) on that door jamb sticker is legally fixed. The F-250 Tremor gets a de-rated sticker (often to keep it at or under 10,000 lbs for cheaper registration and tax purposes in certain states). There is no legal or formal process to just get a new, higher-rated tag printed by the manufacturer.
Long story short: legally, you have to abide by the F-250 sticker for the DOT, but mechanically, your truck has the heart (and the spine) of a one-ton beast.
Enjoy it!