Knocking in passenger side tire when I hit a bump.

Time for an inspection at a tire and alignment shop. The most common causes are broken anti-sway bar links and loose brake pads. Neither of those are particularly serious but there are other things they will inspect to locate worn parts before they cause problems.

If a brake pad is rattling, it will stop if you hold very light pressure on the brake pedal.

Depends on what the source of the noise is. You've already driven it a few days without a problem. The items I mentioned do not require immediate attention but since I can't inspect it over a computer, there's always a chance it could be something more serious. If it was a Ford product, I'd say get it to a shop right now. They have way more than their share of steering and suspension parts that separate and cause a crash. Jeeps don't have that many problems, especially at the mileage you listed.