A mine service vehicle has a forward module, a rear module, and a cab module of unitized construction that can be secured together to assemble the vehicle. The forward and rear modules preferably have frame sections with terminating plates that can be affixed together with bolts, while the cab preferably mounts to the forward and rear modules by resilient couplings. The bolts preferably pass through tension sleeves into threaded holes in bolt receiver plates attached to one of the terminating plates. A frame extender can be affixed between the terminating plates to lengthen the vehicle. The vehicle preferably has a rear axle mounted to axle support bars that are each resiliently, floatably mounted to a pair of axle support brackets by a pivot bolt, with resilient bearings interposed between the axle support bar and the pivot bolt as well as between the pivot bolt and the axle support brackets.