That vibration under acceleration is making me nervous

[laurenceclifford]

So my 2018 Grand Cherokee Summit has developed this weird vibration that only happens when I'm accelerating between 60 and 80 km/h, and it completely goes away if I let off the gas or coast. It feels like something is spinning out of balance but not quite a wheel balance issue because it's load dependent. I took it to a general tire shop and they said my driveshaft might have a bad center support bearing or maybe a worn u joint. The problem is they weren't confident and said I should find someone who actually specializes in this stuff. I've been searching for Mussafah Driveshaft Specialists because I figure that's the kind of place that sees these issues every day, especially on heavier SUVs like mine. Has anyone dealt with this on a WK2? I'm worried about the shaft failing completely at highway speeds. Also curious if a bad transfer case mount could mimic driveshaft symptoms. I'm in Abu Dhabi but work near the industrial area so any recommendations for a shop that really understands driveline vibrations would be a huge help. Really don't want to just throw parts at this blind.