Jeep Commander Owner's Manual page 340

338 STARTING AND OPERATING
LT (Light Truck) - Metric tire sizing is based on U.S.
design standards. The size designation for LT-Metric
tires is the same as for P-Metric tires except for the
letters "LT" that are molded into the sidewall preced-
ing the size designation. Example: LT235/85R16.
Temporary spare tires are high-pressure compact
spares designed for temporary emergency use only.
Tires designed to this standard have the letter "T"
molded into the sidewall preceding the size designa-
tion. Example: T145/80D18 103M.
High flotation tire sizing is based on U.S. design
standards and it begins with the tire diameter molded
into the sidewall. Example: 31x10.5 R15 LT.