Use wheel chocks when uncoupling tractor vehicle from semitrailer. Failure to comply may
result in damage to equipment.
· If semitrailer is parked on level ground; put one wheel chock in front of tire on one side and one
wheel chock in back of tire on other side of tractor vehicle.
· If semitrailer is parked uphill; place one wheel chock on each side of semitrailer in back of tire.
· If semitrailer is parked downhill; place one wheel chock on each side of semitrailer in front of
18. Chock semitrailer wheels (refer to TM 5-2330-37814&P).