Abstract: A self-leveling boom assembly adapted for mounting on one end of a vehicle. The assembly includes a boom support that is adapted for attachment to the rear of the vehicle and has at least two spaced apart horizontally aligned attachment members, an elongated boom with a center section formed of a frame including vertically spaced apart upper and lower horizontally extended beam members connected together by at least two brace members, and two oppositely inclined support arms for pivotally connecting the lower beam member of the center boom section to the boom support.

Abstract: A break away joint assembly for pivotally connecting an outer end boom section to a center boom section of an elongated spray boom to prevent movement of the outer section with respect to the center section from a normal condition in which the sections are colinear to a folded condition. The assembly includes a break away joint that pivotally connects adjacent lower ends of the boom sections and is formed of an inclined ramp disposed on an extension arm at the outer end of the center boom section, a stabilizing member fixed on an extension arm of the inner end of the outer boom section, and a yieldable biasing member extended through the stabilizing member and the center boom extension arm to form a yieldable connection there between.