The answer is theoretically, yes.  In practice, no.

In theory an 18 ton meter crane can lift 18 tons at 1 meter from the center of the crane rotation but in practice this doesn’t mean much because to load or unload a truck requires that the crane reach be in excess of 3.28 feet(1 meter). In practice, then, most crane manufacturers rate the maximum capacity at or around 6-7 feet. Some actually rate the cranes maximum capacity at 4-5 feet which in most cases means a 2nd hook point on the inner boom.

IMT 18 Ton Meter Articulating Crane

IMT articulating cranes are rated for maximum capacity at no closer than 2 meters or 6’6”. When comparing cranes the important number is the crane load moment rating, not necessarily how much it will pick up.