(Looking at the Manitowoc 2892S)
The crane w/o cab weighs 22.4klbs, the telescopic jib is 1226lbs, and the cab is 575lbs. The 14' flat bed is 1260lbs.
The telescopic jib is good for a max of 5400lbs (25' radius, 145' tip height). the winch is rated for up to 8500lbs of line pull.
The chassis requirements require a 258" wheel base, 192" CA, 277" cab to end of frame. Minimum 52klb GVW, 18k up front and 34k in the rear with a minimum 8k/8.3k on the front/rear axles (w/o the crane)
147'9" tip height w/ telescopic jib, 690lbs @ 105' max radius.
820@ 90' max radius with the boom only (1080lbs with the jib swung)
Not a bad size for straight tree work.