invention also includes a pair of spaced tag axle arms 46 and 46a each connected at one end to the outer frame member 42 and spanned near the other end by an inner transverse frame member 48 normally a heavy tubular member pivotal mounting assemblies generally at 50 and 50a pivotally connect tag axle arms 46 and 46a to the longitudinal chassis members 32 and 32a as will be described the tag axle system is deployed and stowed using a tag axle cylinder mounting lever 52 fixed to the tubular member 48 and operated by a fluid cylinder which is partially shown at 53 the cylinder is attached by a tag axle cylinder pivot mount as at 54 fig1 and 2 a tag axle fender is depicted at 56 of course fig1 and 2 show the tag axle assembly in its deployed or ground engaging position while fig3 is a rear view of the system in a raised or stowed orientation although not specifically shown in the figures the open frame construction enables the tag axle system to be stowed over and substantially in front of the movable discharge chute 60 of the chute system 20 locating the tag wheels at a relatively long span behind the dual wheels 30 enhances the support and interaxle distance provided of particular significance with respect to the invention are the mounting assemblies 50 50a these assemblies must carry all of the truck supporting forces yet allow easy vertical pivoting of the tag axle system.