Vehicle frame assemblies with threaded connections

A vehicle frame assembly, comprising:

• a first structural member composed of a first material;
• a second structural member composed of a second material;
• a third structural member welded to the second structural member with a third member long axis intersecting a second member long axis;
• compatible threads on the first and second vehicle structural members;
• and
• corresponding fastener holes on the first and second structural members configured to jointly receive a fastener.

A vehicle frame assembly comprising:

• a first linear member formed of a first material, the first linear member having a first central axis and a first threaded portion with a first fastener hole extending through the first threaded portion;
• a second linear member formed of a second material, the second linear member having a second central axis, a second threaded portion with a second fastener hole extending through the second threaded portion, and a third threaded portion, the second threaded portion being engaged with the first threaded portion such that the first and second central axes are generally coaxial;
• a first bolt extending through the first and second fastener holes to restrain rotation of the first linear member relative to the second linear member;
• and
• a third linear member formed of the second material, the third linear member having a fourth threaded portion, the fourth threaded portion being engaged with the third threaded portion.