Hey people for the biggest telehandlers it must be for capacity the Manitou MHT10210- 21 tonne (46000lbs?) lift capacity, & for height the Manitou MRT3050 with a lift height of 29.70 metres (98ft?).
On the MRT Manitou in the picture the box at the top of the boom is the electro-hydraulic connection for the aerial work platform, the other box at the top of the main boom looks to be the remote control signal receiver. On the larger Roto Manitou's, along with Merlo & Dieci (in US Xtreme) Roto Telehandlers its mounted on upper structure of the machine, mine it's behind the cab.
It is possible to mount a variety of attachments at the head of the machine, the MRT2450 Privelige I'm on has a set of floating forks,, 6 metre jib with intergated winch, a seperate 5 tonne winch, hydraulic block grab which we can also load out roof tiles with, bucket, a hitch mounted road sweeper & a remote control work platform. The remote control can also be used with the winch, block grab & forks which is invaluable for loading out houses etc especially when you can get the truck drivers to set the stuff handy to where your gona place it ie so that your slewing about 90' to lift it instead of having to tramp all over the site to gather it up.