60s-70s rough terrain crane. Grove RT58, RT60 or something along those lines.
It looks like a cherry picker type crane. In the trade they are called 'widow makers'.
Might be a telescopic handler, basically a giant forklift
It's more of a crossover between crane and forklift. telehandlers are more useful than a forklift, but less useful than a crane while being much more mobile than a crane. all four wheels can turn/steer so it is pretty agile.