A frame assembly for a motor vehicle includes a tubular frame and a support tube. The tubular frame includes a first portion connected to a second portion. The first and second portions define a hollow cavity therebetween. A support tube is positioned within the hollow cavity between the first and second portions. The support tube has an exterior surface. The first and second portions include first and second indents respectively formed therein. The first and second indents engage the exterior surface of the support tube to secure the support tube between the first and second portions.