A Newtonian system mathematically always a trivial bundle?

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The phase space of a Newtonian system is defined as a cotangent bundle, where the base space is the manifold M representing the configuration space and the typical fiber is the cotangent space T*M, which consists of momenta. It is established that the cotangent bundle is not always a trivial bundle M x TM. This is due to the fact that while cotangent bundles can be homeomorphic to tangent bundles, tangent bundles themselves are not universally trivial. Therefore, the assertion that M cross TM represents the manifold cross the tangent bundle is incorrect.

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The phase space of a Newtonian system is a cotangent bundle, where the base space is the manifold M of the configuration space (the positions) and the typical fiber is the cotangent space T*M (the momenta). Is it always the case that this cotangent bundle is the trivial bundle M x TM?
 
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No. The cotangent bundle is homeomorphic to the tangent bundle and tangent bundles are not always trivial. M cross TM is the manifold cross the tangent bundle, which is not what you want to say there.
 
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