Your pictures a not very detailed and do not show many areas of interest as far as the telltale signs of rot go.
What I do see:
The cabover window seal looks odd. Maybe was taped over at one time, or resealed very unprofessionally, or both. These windows are a known area for leaks, and so are the marker lights. Doubly so on sheetmetal siding as these are more difficult to seal properly.
The passenger side front corner of the cabover also looks odd, the edge should be rounded smoothly like the driver side edge. Another indicator for a potential leak, damage, or substandard repair.
Any water entering the cabover will pool in the cabover floor framing or run down the camper front wall, eventually compromising the structure that the front jacks mount to. If the jack mounts are "wobbly" with the camper resting on them, or already show signs of damage control (large amounts of sealant, aluminum diamondplate patches, etc.), you are likely looking at a major project.
Open all doors and hatches and look for water stains in the lower edges. Feel around with your fingers. It is difficult to describe what to look for until you have repaired your first rot damage...
Usually, you can not smell rot, and it is often impossible to see, because most visible surfaces are covered with a very thin layer of plastic / vinyl.
What is with the furniture door lying on the dinette seat? Is there a split in the table?
I wish you luck!