This paper scrutinizes the dynamic cross-interaction of two adjacent rocking objects standing on coupled or conjoined bases. Equations governing the motion of the coupled system are derived in non-dimensional form. Experimental results are used to validate the model adopted, including cases with the blocks located on bases that are coupled with either a flexible or rigid connection. The significance of dynamic cross-interaction on rocking behaviour is explored through a numerical parametric study using the proposed model. The results indicate dynamic cross-interaction between two rocking blocks will have a significant effect on their rocking behaviour. It was observed that when the bases of two blocks are coupled there will generally be a transfer of dynamic energy, resulting in the rocking amplitude of one block increasing and the rocking amplitude of the other block decreasing. Specific characteristics that resulted in the rocking amplitude of one of the blocks increasing included: smaller size, increased slenderness and larger mass.