To decrease track derailment of tracked fire trucks in forested areas. a fish-bellied swing arm torsion bar suspension system is proposed in this research. Derived from a tracked forest fire engine. this study converts the shaft tube swing arm of the original vehicle to a fish-bellied swing arm. https://www.ngetikin.com/limited-buy-NHL-Dallas-Stars-Lineup-iPhone-13-Skin-p119122-great-pick/