Most manufactured homes are built on a steel frame, and that frame generally will be very stable. But double and triple wides are multiple frames joined together, and one frame may be on a support that is not equal in support/height to the others.
The steel frame being the floor.... which is why I wrote that all the jacks should be evenly supporting the frame (even on a single wide uneven jacks can stress the floor system) and the joining bolts not slipped/pulled. Essentially, we are saying the same thing.
Stick framed houses settle too. But the cracks can be symptoms of the foundation/et. al. not being sound.
"CAN BE" is the operative term. But NOT without further indications of moderate to serious foundation cracks, typically in corners, or in the ends or middle in excess of 1/8" to 1/4" or more, especially with V shaped widening of the crack or with horizontal/vertical displacement, and typically staircase cracks in brick exterior, or tearing aspect/looks/appearance of interior drywall cracking. Lacking those further indications, it's typically normal minor settlement of any house more than 1yr old and can be safely considered cosmetic. Please let's use good/complete info and not be overly dramatic/scary.
I've been flipping/rehabbing housing since 1975, am a professionally trained retired Home Inspector, sat twice on the Home Inspector Advisory Committee, consulted with literally hundreds of engineers, architects, and other inspectors and have professionally inspected well over 3000 homes, mobiles, cabins, commercial buildings, etc. Trust me on this.
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