This is a generic mobile crane, with inspiration taken from the Liebherr lineup of mobile crane (I looked especially at the Liebherr LTM 1250-5.1) which is easily printed with any 3d printer and with minimal supports except underneath the vehicle. It came out very nice of my Flashforge Finder II when tried (at the same size the model's in).

This is part of a hobby project of mine that included making 200+ vehicles, aircrafts and naval vessels for a fictional armed forces (of the equally fictional country of Acorsia).