I gradiated from a 55' LRIV to the 75 foot altec elevator....
That's a GREAT truck for pruning, mostly doing reduction pruning on large horizontal branches..
Check this video.. you need that extra height and side reach for big trees..
Its been a God Send.. broke my ankle this year on Saturday and was back in the bucket on Wednesday, (on a stool), worked a good 5-6 hours on Thursday and was back to full days on Monday.
Tree Pruning Malvern PA.mov - YouTube
ps.. the LR IV is for sale... 97 GMC, around 70K miles, pony motor works...... not pretty, but a real work horse
another vid: (shows the bucket at work towards the end..
Proper Tree Pruning Paoli PA 19301 .mov - YouTube