4000', wouldn't be a NZ pilot, we try not to go more than about 5' off the ground.
i lifted some 600' long plastic pipes, at the end of a 100' line, thought i was pretty clever. hard to see the bottom and pick when i was touching down. had a guy on the ground and used the alt, just kept driving down and forward where i had to lay it out. biggest problem was laying down as the ground was rolling, and sometimes the pipes decided to start heading down the hill as i was halfway through laying it down....
weight on 600' was alright for a JR, can't remember, about 400kg ish, but was full of crap, so pickup made a mess at the downhill end as i was taking the other end up...