When I was a field engineer at Chicago Bridge & Iron back in the early '90's, we'd call telescoping boom cranes running on 4 tires, Cherry Pickers. Maybe that's not correct, but we called JLG's "manlifts". There were a bunch of times we'd "pick" a man basket from the "cherry picker". It's been a few decades since I was in industrial construction & my crews at CB&I may have had their own terminology, not arguing. Regardless, a telescoping mobile crane on 4 wheels is what I looking at renting.
A friend of mine wants to use a pnuematic sawzaw to cut the piles a few feet above the mudline, then build a floating deck. I may go that route. He seems very eager to help.
AKA 13-0